Ann said to Jane,"You have a very well paid job."
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.
Option A is correct as the given sentence is in the present perfect tense and to report it, the past perfect tense is used and the appropriate introductory verb (tell) is used in the past tense.
Options B, C, and D are wrong as 'has' and 'said to' cannot be used.
The correct answer is A)Ann told Jane that she had a very well paid job.