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: Free trade
 Argument: Free trade promotes peace and stability internationally.
[EX A]: in favor

[EX Q]: Topic: Cellulosic ethanol
 Argument: Cellulosic ethanol land-use harms forests, environment, climate.
[EX A]: against

[EX Q]: Topic: 700 mile US Mexico border fence
 Argument: Migration Policy Institute (nonpartisan).
[EX A]:
neutral