Which sentence has a gerund functioning as the object of a preposition?

In choice A, “meeting” is a gerund because it names an activity, and it is the object of the preposition “for” in “for meeting with them.” In B, “Driving” is the subject of the sentence; in C, “to learn” is an infinitive; and in D, “biking” is the object of “enjoy,” not a preposition.

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