Question

6. In which sentence are the italicized words a dependent clause? (A dependent clause can't stand as a sentence on its own.)

A. The diving board broke when she jumped into the pool.
B. She wanted to leave early, or she wanted to stay overnight.
C. She became angry, but she would not leave without her brother.
D. She went swimming, and her brother went boating.

Answer 1

It's in A, "... [when] she jumped into the pool".

Answer 2

The correct answer is A. The diving board broke when she jumped into the pool.

Like you already wrote, a dependent clause cannot stand on its own - this means that it has to be a part of a larger, independent clause, in order to make sense. If you just wrote when she jumped into the pool, and nothing else, then the sentence wouldn't make sense because it is incomplete.