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".

topic: Natural gas vehicles
argument: Natural gas utilities have a long record of safety
in favor

topic: Ground zero mosque
argument: Defending mosque honors constitution first responders were protecting.
in favor

topic: 700 mile US Mexico border fence
argument: A border fence would create an incentive for illegal immigrants to remain inside a country

in favor