Determine which statement uses a valid argument. A.
If it is hot outside, then Matt will not wear a jacket. Matt is not wearing a jacket. Therefore, it is hot outside.
B.
If it is Tuesday, then the library is open. The library is open. Therefore, it is Tuesday.
C.
If it is summertime, the museum closes at 6 p. m. It is 7 p. m. in the summertime. Therefore, the museum is closed.
D.
All practicing lawyers must pass the bar exam. Chris did not pass the bar exam. Therefore, Chris is a practicing lawyer.

C

Explanation:
A is wrong because it just specifies a certain situation, when Matt could be not wearing a jacket because he is inside.

B is wrong because it is not specified that Tuesday is the only day the Library is open.

C is right because it does specify under what conditions the museum is closed, and the following statement falls under the condition.

D is wrong because it established that all need to pass to be a practicing lawyer, Chris did not pass, but it is asserted that he is a lawyer making this assertion invalid.