The correct answer should be C. The smell of bacon and eggs was my alarm clock on cold mornings.
To help you in the future, just remember that figurative language is essentially just a statement that isn't literal. In A and B, both of those things actually happened. However, for C, bacon and eggs didn't start ringing an alarm to wake them up.
"I don't know why he's being so rude, do you know what he said to me? He said, 'I hate being around you.' How rude!" Like that!
I would say A.) the assertion and the reason are both correct, and the reason is valid.