I’ll call you . . . . . . . . six o’clock. A. at B. on C. in D. of

The correct answer is: A. at

The word “at” is used to indicate a specific time. In this case, the speaker is saying that they will call the listener at six o’clock.

The word “on” is used to indicate a specific day or date. For example, you might say “I’ll see you on Monday.”

The word “in” is used to indicate a specific period of time. For

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