Explanation:

Correct answer is (a). If we read the sentences carefully, we can observe that the statements I and II simply suggest that India should go ahead exposing Pakistan while covering news report about terror attacks in Afghanistan. Applying the elimination technique, let’s check the relevance of each of the options one by one.
Possibility 1. 
While Indian media has been covering news reports about terror attacks in Afghanistan, It is imperative that Pakistan’s proxy war in Afghanistan be highlighted much more prominently, Afghanistan being our strategic partner. Clearly, the above synthesis is both grammatically and contextually correct and keeps the flow intact. This hence eliminates option B.
Possibility 2.
Afghanistan being our strategic partner, it is imperative that Pakistan’s proxy war in Afghanistan be highlighted much more prominently, Indian media has been covering news reports about terror attacks in Afghanistan. Clearly, we can observe that the above formation doesn’t make a coherent synthesis. Hence, this eliminates option C as well.
Possibility 3.
Despite Indian media has been covering news reports about terror attacks in Afghanistan, it is imperative that Pakistan’s proxy war in Afghanistan be highlighted much more prominently, Afghanistan being our strategic partner. Though the above construction looks fine at the first glance, it is not logical in the context.
Clearly, option A is the correct answer.