This question tests three sound-alike words that trip up most readers: pray, prey and prying. To answer it, check whether each sentence uses its word in the meaning that word actually carries.
Since every one of the three sentences, A, B and C, uses its word correctly, the combination that matches is "A, B and C," which is option (C).
Let's summarize:
The correct answer is option (C), A, B and C.