Indicate which one of the following sets of observations each having a mean of 50has the larger standard deviation. (Calculations aren't necessary to...

Indicate which one of the following sets of observations ‑‑each having a mean of 50‑‑has the larger standard deviation. (Calculations aren't necessary to answer this question.)

A.40, 45, 50, 55, 60

B.40, 49, 50, 51, 60

C.40, 42, 50, 58, 60

D.40, 40, 50, 60, 60