Select the option that expresses the given sentence in reported speech.

I said to the bank manager, "I have forgotten my account number."

I told the bank manager that I had forgotten my account number.

The correct option is:

I told the bank manager that I had forgotten my account number.

The other options are incorrect:

• I said to the bank manager that I have forgotten his account number. This is incorrect because the speaker is talking about their own account number, not the bank manager's account number.
• I said to the bank manager that he had forgotten his account number. This is incorrect because the speaker is not saying that the bank manager has forgotten their account number.
• I informed the bank manager that I forgot the account number. This is incorrect because the reporting verb "informed" is used to tell someone something that you know, not something that you have forgotten.