Which of the following is a correct sentence featuring a present participle?

A present participle is a verb form that typically ends in "-ing" and is used to indicate an ongoing action or a continuous state. In the context of the given sentences, all examples utilize present participles correctly to convey actions happening in the present.

In the first choice, "trying" is the present participle describing what the students are currently engaged in. The second choice implies that all responses are valid. The third choice features "driving," indicating that the action of driving is ongoing. In the last example, "giggling" describes the children whose laughter is presently happening before they fall asleep.

Each sentence accurately incorporates a present participle, demonstrating its use in conveying continuous actions. Thus, choosing the option that states all answers are correct is appropriate, as they all effectively illustrate the function of present participles in the sentence structure.