one question, 3x.

if this parking policy is unpopular with the faculty, then we should modify it. if it is unpopular among students, we should adopt a new policy .and, it is bound to be unpopular either with the faculty or among students.

if the statements aboves are true, which one of the following must also be true.

the answer as follows:

if this parking policy is popular with the faculty, then we should adopt a new policy.

i used elimination method to get the right answer, but can someone give me a clear idea? 3x!