Simple concept of standard deviation is tested here. which is how far the numbers are from the mean of the list.
Lets given some values, a=0, b=1, c=2, d=3, e=4 which is list S, that given list T as {-2,0,2,4,6}
A: the mean of list S is 2, the deviation from mean for respective numbers is {2,1,0,1,2}
B: the mean of list T is 2, the deviation from mean for respective numbers is {4,2,0,2,4}
Clearly, the numbers in list T are deviated more from the mean than numbers from list S, so the quantity A<B
Hence we choose option B as our answer.