Speaker A: Hello, may I speak to Alan Bright？ Speaker B: ______A．Hello, may I ask who you

Speaker A: Hello, may I speak to Alan Bright？ Speaker B: ______

A．Hello, may I ask who you are？

B．Hello, please wait for a moment and I"ll go to call him.

C．Speaking.

D．Hello, I"m Alan Bright.

请帮忙给出正确答案和分析，谢谢！