The given sentence is a statement.
In the indirect speech 'told' may be used for 'said to'.
According
to the rules of narration and reporting, if the reporting verb is in
the past tense, the tense of the reported verb is changed into its
corresponding past form. The reporting verb in the given sentence,
'said', is in the past form. Therefore, the reported verb, 'is' will
change into 'was'.
Thus, in indirect speech, the sentence must be,
Ann told me that he was very lazy.
Thus option B is the correct answer.
Options A,C,D are incorrect as they do not follow the rules of Narration and Reporting.