Definition: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Input: [header] How to tell if a girl is messing with you [title] Watch how she flirts. [step] How a girl flirts can give you an idea of whether she is really interested. Watch and take note. <sep> (A) A girl who flirts playfully but doesn't flirt back, then that person is probably interested, too. [substeps] Wait until the two of you are alone to try flirting. (B) It's good to see whether an outgoing girl uses her body language to let you know she's interested in you. See if she has a subtle pout, for example. (C) How intense is her flirting? Does it seem light-hearted and friendly? This may mean she's not seriously interested. It could be something more if her attention feels like more than just play, though. (D) [substeps] If she teases you back once on a test, she may want to use it again on the next test. On a new test, she may flirt lightly and then joke around a little, but not with a lot of energy.
Output:
C