Which Statement Correctly Compares T-Distributions to the Normal Distribution

Multiple Choice

Which statement correctly compares t-distributions to the normal distribution?
I. t distributions are also mound shaped and symmetric.
II. t distributions have less spread than the normal distribution.
III. As degrees of freedom increase, the variance of t distributions becomes smaller.

A) II only
B) I, II, and III
C) I and III only
D) I and II only
E) I only