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: Lowering US drinking age from 21 to 18
 Argument: 21 drinking-age general lowers under-age drinking.
against

Topic: Funding transparency for TV issue ads in elections
 Argument: General statements against disclosing TV issue ad funding.
against

Topic: Vehicle fuel economy standards
 Argument: Fuel economy standards do not increase the cost of making cars.

in favor