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

He said to me, "It was raining all day."

He told me that it had been raining all day.

The correct option is He told me that it had been raining all day.

The other options are incorrect:

• "He told me it is raining all day." is incorrect because the verb tense is incorrect. The reported speech sentence should be in the past tense, not the present tense.
• "He told me it has been raining all day." is incorrect because the verb tense is incorrect. The reported speech sentence should be in the past perfect continuous tense, not the present perfect tense.
• "He told me it was raining all day." is incorrect because the reporting verb is "told", which is in the past tense. Therefore, the reported speech sentence must also be in the past tense.