Correct option is A. John said that his sister takes him out for a dinner every week.
Direct speech is a sentence in which the actual words of the speaker are quoted.
Indirect speech is a sentence in where we report what someone said, without quoting his exact words.
A universal truth includes any moral principles, natural phenomena, mathematical equation, scientific statement.
Here, option A is correct. When sentence in quoted words relates to some universal or habitual fact, the simple present tense in it remains unchanged.
Habitual actions refers to the actions that are done regularly. Moreover, 'my' changes to 'his' and 'me' to 'him' as speaker is John and he is referred here.
In option B tense in changed. So, it is incorrect.
In option C meaning is irrelevant. So, it is incorrect.
In option D meaning is changed and is wrong. So, it is incorrect.