Who was the first man . . . . . . . . the moon? A. in B. at C. of D. on

The correct answer is D. on.

The word “on” is used to indicate a location on a surface. In this case, the surface is the moon. The other options are incorrect because they do not indicate a location on a surface.

• The word “in” is used to indicate a location inside something. For example, you might say that you are “in” a room or “in” a car.
• The word “at” is used to indicate a location near something. For example, you might say that you are “at” a park or “at” a store.
• The word “of” is used to indicate possession or association. For example, you might say that you are “of” the United States or “of” the planet Earth.