Identify the tense used in the following sentence:
I will give him a gift.

In the sentence "I will give him a gift," the tense used is Simple Future. The word "will" is the auxiliary verb used to indicate the future tense. In Simple Future, we use the base form of the main verb without any inflection, and it is employed to talk about actions that will happen in the future. So, in this sentence, the action of giving "him a gift" is planned for the future, making the correct answer D.