Voracious is hungry or eager, hence indifferent is an antonym.

Correct Option: D

Voracious is hungry or eager, hence indifferent is an antonym.

As we know that ,
Irascible is hot tempered, or someone who easily gets angry, roguish is playful .

Correct Option: C

As we know that ,
Irascible is hot tempered, or someone who easily gets angry, roguish is playful ., it is more clearly an antonym to hot tempered than friendly or even kind. Both words Irascible and roguish concern the temperament of a person, while others are about his nature.
Hence , roguish is antonym of Irascible .

As we can say that ,
Careful is opposite word of Perfunctory.

Correct Option: C

As we can say that ,
Perfunctory is a task performed only for the sake of it, done carelessly without much attention.
Thus , Careful is opposite word of Perfunctory.

As we know that ,
hovel is opposite word of Mansion .

Correct Option: B

As we know that ,
Mansion is a very big house, while hovel is a small, dingy house, castle is a large fortified residence.
Hence , hovel is an opposite word of Mansion .

As we can say that ,
charming is antonym of Termagant .

Correct Option: A

As we can say that ,
Termagant means quarrelsome or someone who always quarrels while charming is the one who pleases. Turbulent means agitated. Brawling is to fight and create noise, shrewish also means quarrelsome.
Hence , charming is antonym of Termagant .