An action in a sentence can be represented in two ways, namely active and passive voice.

The passive voice always uses the past participle form of the main verb irrespective of any tense. Only the auxiliary verbs depend upon the sentence given in active voice.

The given sentence is in the active voice.

The correct answer is B) Can it be sent by air?

Option B) is correct as the object of the given sentence(it) comes in the place of  the subject (we- which is not required in the sentence). Also, the main verb (send) is used in the third form (sent ).

Options A, C, and D cannot be used here as 'this' cannot be used in the place of 'we', the given main verb is not 'go' and the form of the main verb is not changed respectively.