-----------the gift was intended ,we never discovered.

a To who
b To whom
c For who
d For whom

And your answer is?

D IS IT CORRECT?

Yes, D is correct.

To whom

The correct answer is "To whom."

In this sentence, the phrase "To whom" is used as an indirect object. When deciding whether to use "who" or "whom," you can follow these steps to determine the correct pronoun:

1. Identify the verb: In this case, the verb is "intended."
2. Determine if the pronoun is functioning as the subject or the object of the verb. In this sentence, "To whom" is receiving the action of the verb, so it is functioning as the object.
3. Substitute "he/she" for "who" and "him/her" for "whom" to test the correctness. For example, if it's "he/she intended" or "him/her intended," the correct form would be "whom."
4. Based on the substitution mentioned above, if "he/she" sounds correct, then it should be "who," and if "him/her" sounds correct, then it should be "whom." In this case, "him/her intended" sounds correct, so the correct pronoun to use is "whom."

Therefore, the correct option is "b) To whom."