Six o'clock was the time when we were supposed to be there. What type of clause is the underlined part?

Explanation

The correct answer is B: Adjective because the underlined clause 'when we were supposed to be there' modifies the noun 'time' by providing specific information about it. This makes it an adjective clause. Option A is incorrect because, while a noun clause serves as a subject, object, or complement, this clause does not fulfill any of those roles. Option C is incorrect because an adverb clause modifies verbs, adjectives, or other adverbs, and this clause does not perform that function. Lastly, option D is incorrect because an independent clause can stand alone, whereas the underlined clause is dependent on the main clause for its meaning.