Why did you not agree to my proposal?
A
Why was my proposal not agreed to?
B
Why was my proposal not agreed by you?
C
Why my proposal was not agreed to by you?
D
Why was my proposal not agreed to by you?
Correct Answer: Why was my proposal not agreed to by you?
Why was my proposal not agreed to by you?When a sentence is started with wh-words (Who, Which, whom, where, when, why, whose, whom, and how.) then passive voice also started with same wh-word.
Rule :
Wh-word + auxiliary verb + subject + V3 + other agents.