小明参加普法知识竞答，共有10个不同的题目，其中选择题6个，判断题4个，今从中任选一个，选中______的可能性较小．

Surely the day you are informed of your being admitted to a famous key university will be ________ of joy and celebration for your family, relatives and friends.

A．that

B．the one

C．one

D．those