Correct Answer: (a) My landlord says that he reads books in his free time.
Solution:In the given question, Reporting verb is in Present Tense, so there will be no change in the tense of Reported speech. When it will be converted into Indirect Narration, 'that' conjunction will be used and Pronoun (I) will be changed into 'he according to the Reporting verb.
Hence, option (a) is correct answer.