I will meet him . . . . . . . . Saturday afternoon. A. into B. to C. with D. on

The correct answer is D. on.

The preposition “on” is used to indicate a specific day or date. In this case, the speaker is saying that they will meet the person on Saturday afternoon.

The other options are incorrect because they do not indicate a specific day or date.

• The preposition “into” is used to indicate movement from one place to another. For example, “I will go into the store.”
• The preposition “to” is used to indicate a destination. For example, “I am going to the store.”
• The preposition “with” is used to indicate that someone is accompanying someone else. For example, “I am going to the store with my friend.”

I hope this helps!