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.