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". 
One example: Topic: Three Gorges Dam
 Argument: The Three Gorges Dam is a cause of corruption.
Solution is here: against
Explanation: Here, argument is against the given topic, three gorges dam. Hence, the answer is "against".

Now, solve this: Topic: Turkey EU membership
 Argument: Turkey's EU membership would help the fight against terrorism.
Solution:
in favor