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". 
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Question: Topic: Lowering US drinking age from 21 to 18
 Argument: 21 drinking-age general lowers under-age drinking.

Answer: against


Question: Topic: Geoengineering, solar shading
 Argument: Solar shading can effectively and rapidly reverse global warming.

Answer: in favor


Question: Topic: Seattle deep-bore tunnel
 Argument: Seattle tunnel less disruptive than other options.

Answer:
in favor