Concept:Recognise the expression as a perfect square trinomial of the form a2−2ab+b2=(a−b)2.Explanation:Compare k2−2kp+p2 with a2−2ab+b2.Here, a=k and b=p.The middle term is −2kp=−2⋅k⋅p.So the trinomial matches the square of a difference.Thus, k2−2kp+p2=(k−p)2.Answer:Option B: (k−p)2