In the question one statement is given, followed by two arguments, I and II. You have to consider the statement to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given arguments, if any, is a b argument.

Statement: Should the village authorities build a water tank in their village?

Argument I : Yes, a tank is essential as it will provide water for dry summer months.
Argument II : No, the sharing of tank water will lead to disharmony amongst the villagers.