单项选择题

[听力原文]
W: I thought your eyesight was excellent even in the dark. Why don’t you turn on the light
M: I don’t know where the switch is.

Why doesn’t the man turn on the light()

A.It was too dark.
B.His eyesight is not so good.
C.The man doesn’t want to.
D.He can’t find the switch.