Concept:Use the difference of two squares formula: a2−b2=(a−b)(a+b).Explanation:Let a=2p−q and b=p+q.Then (2p−q)2−(p+q)2=(a−b)(a+b).First, find a+b:(2p−q)+(p+q)=2p+p−q+q=3p.Next, find a−b:(2p−q)−(p+q)=2p−q−p−q=p−2q.Multiply the two results:3p(p−2q).Answer:A. 3p(p−2q)