Which sentence contains word in italics that form a gerund phrase A the laughing boy sat down B an interesting novel provides good entertainment C winning race demanded speed and endurance D you a?

Here's why:

* Gerund Phrase: A gerund phrase is a group of words that acts as a noun. It starts with a gerund (a verb ending in "-ing" that acts as a noun).

* In Sentence C: "Winning the race" is the gerund phrase. "Winning" is the gerund, and the phrase acts as the subject of the sentence ("Winning the race demanded speed and endurance").

Let's look at the other options:

* A. The laughing boy sat down: "Laughing" is a participle, not a gerund.

* B. An interesting novel provides good entertainment: "Providing good entertainment" is an infinitive phrase, not a gerund phrase.

* D. You a?: This sentence is incomplete and doesn't contain a gerund phrase.