Ann said to me,"Are you working tomorrow?"
The two ways of relating what a person has said are 1)direct and 2)indirect (reported).
In the direct speech, the exact words of the original speaker are repeated.
In the indirect speech (reported speech), the exact meaning of what the speaker told is expressed but not necessarily in the speaker’s exact words.
Options A and B are correct as the question inside the inverted commas is transformed into an affirmative sentence using the past continuous tense (was working) as the question is in the present continuous tense and uses the appropriate introductory verb (ask) in the past tense. The conjunctions 'if' and 'whether' both can be used to join the two clauses.
Options C and D are wrong as 'told' and 'you' cannot be used.
The correct answer is A)Ann asked me if I was working the next day. and B)Ann asked me whether I was working the next day.