Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
Cakes are baked by my mother.

Correct Option: C

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
Cakes are baked by my mother.
Hence , option C will be correct answer .

We can say that ,
The above given sentence is given in Passive Voice :-
Use structure “subject + auxiliary + past participle + by + object”
Several items in the room were destroyed by the burglar. He has even torn the carpet.

Correct Option: D

We can say that ,
The above given sentence is given in Passive Voice :-
Use structure “subject + auxiliary + past participle + by + object”
Several items in the room were destroyed by the burglar. He has even torn the carpet.
Therefore , option D is correct answer .

Use structure “By + question word + auxiliary + past participle + object ?”
As per the given above sentence is given in Passive Voice.
By whom was it written?

Correct Option: B

Use structure “By + question word + auxiliary + past participle + object ?”
As per the given above sentence is given in Passive Voice.
By whom was it written?
Therefore , option B will be required answer .

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
Good men are praised by everyone.

Correct Option: D

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
Good men are praised by everyone.
Thus , option D will be required answer .

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
The wounded woman was being helped by some people.

Correct Option: B

Use structure “subject + auxiliary + past participle + by + object”
As per the given above sentence is given in Passive Voice.
The wounded woman was being helped by some people.
Therefore ,required answer will be option B .