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: Hybrid vehicles
 Argument: Hybrids increase efficiency by shutting engines down while idling.
in favor

Topic: Prostitution
 Argument: By worsening HIV/AIDS, prostitution will devastate societies.
against

Topic: Electric vehicles
 Argument: Domestic electricity is required for electric cars to replace gasoline.

neutral