Concept:Use the binomial expansion or standard limit formula.Explanation:Rewrite (1−x)n=1−nx+2n(n−1)x2−… (binomial expansion).Then (1−x)n−1=−nx+higher powers of x.Divide by x: x(1−x)n−1=−n+terms containing x.As x→0, the terms with x vanish, leaving −n.Alternatively, recall the standard limit limx→0x(1+ax)n−1=an.Here a=−1, so the limit is (−1)n=−n.Answer:−n (Option C).