Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: Natural gas vehicles
 Argument: Odorless natural gas can escape detection risking fire/explosion.
against

Topic: Ground zero mosque
 Argument: Defending mosque honors constitution first responders were protecting.
in favor

Topic: Israeli settlements
 Argument: Jewish settlements are not part of any illegal occupation.

in favor