Explanation

A is correct because Youm ul Nijat means the Day of Salvation, which is associated with the Battle of Badr. B is incorrect because Youm ul Fatih refers to the day of conquest. C is incorrect because Youm ul Deen relates to the Day of Judgment. D is incorrect because Youm ul Furqan means the Day of Distinction and does not specifically refer to Ghazwa-e-Badar.