What is an example of a gerund functioning as an object?

The correct choice represents a gerund functioning as an object within the sentence. In the context of the sentence, "swimming" is derived from the verb "swim" and is acting as a noun, which in this case is the object of the verb "is." The phrase "Her favorite activity is swimming" highlights the nature of gerunds as verb forms that end in -ing, allowing them to take on noun-like roles in sentences.

Choosing this option aligns with the definition of a gerund and illustrates how it can seamlessly integrate into a sentence structure while maintaining its grammatical function as an object. The other options do not feature gerunds functioning as objects; instead, they include various verb forms and structures that do not fulfill the gerund role as required by the question.