Explanation

B is correct because Hazrat Fatima (RA) was the eldest daughter of Prophet Muhammad (SAW). A is incorrect because Hazrat Zainab (RA) was a granddaughter. C is incorrect because Hazrat Umme Kulsom (RA) was another daughter but not the second one listed in common historical accounts for this question format. D is incorrect because while she was a daughter, B is generally considered the primary answer when listing daughters sequentially or by prominence.