The correct word is given as :-
dark, frightened

Correct Option: C

As we can say that ,
The correct word is filled in the above given sentence :-
The tunnel was so dark and congested, that we became frightened.

Nuance means a subtle difference in colour, meaning, tone, etc; a shade or graduation knee jerk reaction– impulsive reaction which might not be always appropriate because here decesion/reactions are taken without much thinking. Since the issue is nuanced so it has to be studied carefully and given proper time to be analysed otherwise it would result in a loss of opportunity. All other choices are irrevelent.

Correct Option: C

Nuance means a subtle difference in colour, meaning, tone, etc; a shade or graduation knee jerk reaction– impulsive reaction which might not be always appropriate because here decesion/reactions are taken without much thinking. Since the issue is nuanced so it has to be studied carefully and given proper time to be analysed otherwise it would result in a loss of opportunity. All other choices are irrevelent.
The correct word is filled in the above given sentence :-
These issues are extremely Nuanced and any knee jerk reaction will ultimately result in a loss of opportunity for all shareholders

Expert professionals are having to train, and students supplant (replace) teachers.
The correct word is given as :-
are, supplanting

Correct Option: A

As we can say that ,
Expert professionals are having to train, and students supplant (replace) teachers.
The correct word is filled in the above given sentence :-
A growing number of these expert professionals are having to train foreigners as the students end up supplanting the teachers who have to then unhappily content with no jobs at all or new jobs with drastically reduced pay packets

The situation due to the genocides is sinister, which means threatening. So the other word which will fill the first blank has to complement sinister. Thus the options which may fit in can be disingenuous (which means lacking in frankness, candor, or sincerity) or tragic. The other three words are positive words. In the last part of the sentence, 'to ……………. and perpetrators alike' the contrast between the blank word and perpetrators (to commit: to perpetrate a crime) is quite clear. So the correct option is victims, which is antonym to perpetrators.

Correct Option: C

The situation due to the genocides is sinister, which means threatening. So the other word which will fill the first blank has to complement sinister. Thus the options which may fit in can be disingenuous (which means lacking in frankness, candor, or sincerity) or tragic. The other three words are positive words. In the last part of the sentence, 'to ……………. and perpetrators alike' the contrast between the blank word and perpetrators (to commit: to perpetrate a crime) is quite clear. So the correct option is victims, which is antonym to perpetrators.
The correct word is filled in the above given sentence :-
The genocides in Bosnia and Rwanda, apart from being mis-described in the most sinister and disingenuous manner as 'ethnic cleansing', were also blamed, in further handwashing rhetoric, on something dark and interior to victims and perpetrators alike.

The correct word is given as :-
teeming, against

Correct Option: B

As we can say that ,
The correct word is filled in the above given sentence :-
When you want to digitalise a city teeming with millions, you don’t bet against the odds.