B is the correct answer, but I don't understand why. Can someone please explain !

Consider drawing 15 times at random with replacement from each of two boxes of numbers. The first box has the numbers {0, 6.5, 6.9, 7} and the second has the numbers {-1, 1, 4, 6}.

Select the true statement.

a) Overall, the normal approximation to the distribution of the sum of the draws will be more accurate for drawing from the first box than for drawing from the second box.
b) Overall, the normal approximation to the distribution of the sum of the draws will be less accurate for drawing from the first box than for drawing from the second box.
c) Overall, the normal approximation to the distribution of the sum of the draws will be equally accurate for drawing from the first box than for drawing from the second box.
d) Overall, the normal approximation to the distribution of the sum of the draws could be more accurate, equally accurate, or less accurate for drawing from the first box than for drawing from the second box.