Answer: B: If you study for the science test, then there's a chance you'll get an A.
Explanation: This is a very strange question but it is B because it is reflecting things that haven't yet happened, are doubtful, or are based on imagination and that is that is what defines Conditional Mood.
Conditional Mood: "a grammatical mood used in conditional sentences to express a proposition whose validity is dependent on some condition, possibly counterfactual."