Final answer:
The correct statement is C. If the girl does not study, there is no test the next day.
Step-by-step explanation:
The correct statement is C. If the girl does not study, there is no test the next day.
This statement represents a logical implication. It means that if the girl does not study, then there will not be a test the next day. However, if the girl does study, it does not guarantee that there will be a test.
For example, let's say that the boy and girl always study before a test. But if there is no test scheduled for the next day, the girl might still study as a regular study routine. So, the presence or absence of a test does not solely depend on whether the girl studies or not.