Select the option that expresses the given sentence in reported speech.
The policeman said, “It is clear that this is the work of a professional robber”.

A

The policeman said that it was clear that that was the work of a professional robber.

B

The policeman said it was clear that is the work of a professional robber.

C

The policeman said that it must be clear that this was the work of a professional robber.

D

The policeman said that it had been clearly the work of a professional robber.