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". 

[EX Q]: Topic: Education vouchers
 Argument: Profit motive of private schools is costly, undermining vouchers.
[EX A]: against

[EX Q]: Topic: Colonization of the Moon
 Argument: Moon's gravity is too low for human health.
[EX A]: against

[EX Q]: Topic: Natural gas vehicles
 Argument: Odorless natural gas can escape detection risking fire/explosion.
[EX A]:
against