How do you know the underlined part is an dependent clause? Underlined part in parenthesis.

Nancy pulled over to ask for directions (because she was lost).

AIt can stand on its own as a complete sentence and starts with a conjunction.

BIt can't stand on its own as a complete sentence and begins with a pronoun.

CIt can stand on its own and starts with a pronoun.

DIt can't stand on its own and starts with a conjunction.