请选出下面划线部分读音不同的选项。（　）

A、b<span style="text-decoration: underline;">o</span>ttom

B、c<span style="text-decoration: underline;">o</span>lor

C、M<span style="text-decoration: underline;">o</span>nday

D、t<span style="text-decoration: underline;">o</span>n