Concept:Rearranging jumbled parts to form a logical and grammatically correct sentence.Explanation:The given opening "The history of mankind is" is completed by "the history of" (R).Then "continuous change" (Q) naturally follows.The conjunction "and" links to "steady progress" (P).Finally, "from barbarism to refinement" (S) closes the idea.Thus the correct order is R, Q, P, S.Answer:Option B: RQPS.