Given a premise and two alternatives, choose the alternative that is a more plausible cause or effect of the situation described by the premise. The input format is "premise
(1)alternative_1(2)alternative_2", the output should either be "1" or "2" based on your judgment.
Q: The student knew the answer to the question.
(1)He raised his hand.(2)He goofed off.
A: 
1