The correct option is C Both A and B
Normally, the tense in reported speech is one tense back in time from the tense in direct speech. For past tense, past perfect tense is used in reported speech. Hence, Option A is correct. However, we do not need to change the tense if the original statement was about something that is still true, like, the second battle of Panipat. Hence, Option C, that is, both A and B are correct. The rest of the options are individually incorrect.