Which of the following statements is true regarding the t distribution?
a) As n increases, t(k) gets closer to N(0, 1) because the difference between s and σ tends to get larger.
b) As n increases, t(k) gets closer to N(0, 1) because the difference between s and σ tends to get smaller.
c) As n decreases, t(k) gets closer to N(0, 1) because the difference between s and σ tends to get larger.
d) As n decreases, t(k) gets closer to N(0, 1) because the difference between s and σ tends to get smaller.