Correct Answer & Explanation
Option B
• The reporting verb 'said to' changes to 'told' in indirect speech for an assertive sentence. So, option C is incorrect.
• The pronoun 'I' changes to 'he' as per the subject of the reporting verb.
• The tense 'am writing' (Present Continuous) changes to 'was writing' (Past Continuous) because the reporting verb 'said' is in the past tense.
• The conjunction 'that' is used to connect the reporting clause and the reported speech.