问题如下：
Assume there is an increase in degree of freedom, t-distribution will have:
选项：
A. fatter tails and be more peaked.
B. fatter tails and be less peaked.
C. thinner tails and be more peaked.
解释：
C is correct.
The t-distribution will have thinner tails and be more peaked if the degree of freedom is increasing. When degree of freedow is close to infinite, the distribution tends to be normal distributed.
不是尖峰肥尾吗？怎么more peaked 反而尾巴还小了呢
