He comes . . . . . . . . 3 o’clock. A. in B. by C. to D. at

The correct answer is: D. at

The preposition “at” is used to indicate a specific time or place. In this case, the speaker is indicating that the person comes at 3 o’clock.

The other prepositions could be used in different

contexts. For example, “in” could be used to indicate a period of time, such as “He comes in the morning.” “By” could be used to indicate a deadline, such as “He comes by 3 o’clock.” “To” could be used to indicate a destination, such as “He comes to my house.”