Which one of the following sentences contains two ideas joined by a connecting word?

AMike ran after the bus.
BSally lives with her parents, although she could afford her own apartment.
CTina arrived at work earlier than usual.
DFrank went fishing on Saturday he caught many fish.

Verified Answer :

The answer would be B. because it has a comma and then although which is a connecting word. A. would not be your answer because it does not express two ideas. C. Would not be your answer either because it does not express two ideas. D. Is incorrect because it does not have a comma or a connecting word even though it expresses two ideas. Which means the only correct answer would be C. Hope this helps!!