Statement (A) tells us Roma took leave on Wednesday, but does not confirm Wednesday is the Chennai trip day. Statement (B) links travel to mother's visit. Statement (C) restricts mother's visit days to Tue/Wed/Thu/Sat/Sun, so Roma could go Wed/Thu/Fri/Sun/Mon. Even combining all three, no unique day can be pinned down since 'taking leave' is not equated definitively with the travel day.