Concept:The mean of a set of terms is the sum of the terms divided by the number of terms.Explanation:List the terms: 2−t,4+t,3−2t,2+t,t−1.Add the constant parts: 2+4+3+2−1=10.Add the coefficients of t: −1+1−2+1+1=0.So the total sum is 10+0(t)=10.There are 5 terms.Mean = 510=2.Answer:2 (Option A).