The correct answer is D. Where was the parcel sent by you?
A. Where is the parcel sent by you? is incorrect because it asks about the current location of the parcel, not where it was sent.
B. Where has the parcel been sent by you? is incorrect because it uses the present perfect tense, which is used to talk about actions that have happened in the past but have effects that continue into the present. In this case, the action of sending the parcel has already happened and there is no need to use the present perfect tense.
C. Where can the parcel be sent by you? is incorrect because it asks about the possible locations of the parcel, not where it was sent.
D. Where was the parcel sent by you? is the correct answer because it asks about the specific location where the parcel was sent.