请教一级数量问题 least, normal, likely, 正态分布, increase

busterbluth

请教老师mock83-31
which is least likely to increase the reliability of parameter estimates?
A. increase the sample size
B. use of point estimates rather than confidence intervals
C. use of t-distribution rather than normal distribution to establish confidence
答案选B，关于C选项，是不是t分布相比较正态分布而言，分布分散，所以估计没有正态分布准确，那么C也应该选是吗？请老师解答，谢谢！