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

In D, “meeting” is a gerund—the -ing form of a verb used as a noun—and it is the object of the preposition “for” in “for meeting with them.” In A, “biking” is the object of “enjoy,” not a preposition; in C, “memorizing” follows the verb “start.”

AI-written and checked against the verified answer.