Detailed Instructions: You will be given a topic and an argument. Decide the argument's stance towards that topic. The argument's stance is in favor or against the topic. If the argument supports that topic, answer with "in favor"; otherwise, if the argument opposes the topic, answer with "against".
Q: topic: Lowering US drinking age from 21 to 18
argument: Safer roads with 21 drinking laws outweighs all trade-offs
A:
against