Select the correct passive form of the given sentence.
Did you receive my letter?

The correct answer is option 4.
The given sentence is in the past indefinite tense.
The structure that is followed to change the voice of past indefinite tense 'object+ was/were+ V3+ by+ subject'.
Out of the given alternatives, the given structure is followed only in option 4.
Therefore, the correct answer is 'Was my letter received by you?'
Note: As the given sentence is an interrogative sentence, the auxiliary verb 'was' will be used before the object.