* Gerund Phrase: A gerund phrase is a group of words that functions as a noun and begins with a gerund (a verb ending in "-ing" used as a noun).
Let's break down each sentence:
* a) The laughing boy sat down: "Laughing" is a participle, describing the boy.
* b) An interesting novel provides good entertainment: "Providing" is a verb, not a gerund.
* c) Winning the race demanded speed and endurance: "Winning the race" is the gerund phrase acting as the subject of the sentence.
* d) You are going home? "Going home" is a verb phrase, not a gerund phrase.
Therefore, only sentence c) contains a gerund phrase.