You should _____ to the boss

speak 是不及物动词，不能直接接名词,必须加介词。
1.speak to sb. 固定搭配。
I want to speak to you.
2.tell ,ask ,describe 是及物动词 ，后面直接跟名词。
a.tell sb to do sth
b.ask sb to do sth .
c.describe
Words cannot describe the beauty of the scene.
语言难以描述那景色之美丽
He describes himself as a doctor.
他声称自己是医生。

A speak to sb和某人讲话

speak，没什么理由感觉这个对

我选speak,因为tell和ask 是及物动词，describe应该接for

A.speak