Concept:The terms form a geometric progression, so use the nth term formula Tn=arn−1.Explanation:First term: a=−2.Common ratio: r=−24=−2.Substitute into the formula: Tn=(−2)(−2)n−1.Add the powers: (−2)(−2)n−1=(−2)1+n−1=(−2)n.This expression matches option B.Answer:Tn=(−2)n, which is option B.