MrSmith Is Running for Congress

Multiple Choice

Mr.Smith is running for Congress.Alejandro does not know much about Mr.Smith,but he has heard that Mr.Smith is an environmentalist.Because Alejandro cares about the environment,he votes to send Mr.Smith to Washington.After the election,Alejandro finds that Mr.Smith does not act like an environmentalist,and he regrets having voted for him.Alejandro's mistake was forgetting that:

A) a conclusion is true only if the premises are true
B) a conclusion can be valid without being true
C) premises with ambiguous terms lead to incorrect conclusions
D) both B and C