Which Statement Correctly Compares T-Distributions to the Normal Distribution

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

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

Correct Answer:

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