Select the option that expresses the given sentence in reported speech.
He said to me, “How are you now?”

Correct option is D

He asked me how I was then.
Rules for changing direct speech to indirect speech for interrogative sentence-
· When the reporting verb of direct speech is in past tense then all the present tenses are changed to the corresponding past tense, past indefinite changes to past perfect and past continuous changes to past perfect continuous in indirect speech. 
· No conjunction is used, if a sentence in direct speech begins with a question (what/where/when) as the “question-word” itself acts as a joining clause.
· If a direct speech sentence begins with an auxiliary verb/helping verb, the joining clause should be  if or whether.
· Reporting verbs such as ‘said/ said to’ changes to enquired, asked, or demanded.
The direct question "How are you now?" when reported becomes "He asked me how I was then," correctly adapting the tense and perspective for reported speech.