Select the option that expresses the given sentence in reported speech.
He said to me, 'I am grateful to you.'

Correct option is D

The correct indirect speech is (d).
Explanation: In reported speech, the present tense “I am” changes to past tense “he was” as the reporting verb "said" is in the past tense.
The first person pronoun “I” is changed to “he” to match the subject of the reporting clause.
Conversion rules used:
· Present tense changes to past tense in reported speech.
· Pronouns and time expressions are adjusted as per the context.
· Example:
· Direct speech: He said, "I am happy."
· Indirect speech: He said that he was happy.