The correct answer is: A. 46, 5, respectively.
Kashmir and Ladakh regions had 46 and 5 assembly seats, respectively, before the bifurcation of Jammu and Kashmir into two union territories in August 2019.
Option B is incorrect because it states that Kashmir and Ladakh regions had 46 and 4 assembly seats, respectively. This is not correct because Kashmir had 46 assembly seats and Ladakh had 5 assembly seats.
Option C is incorrect because it states that Kashmir and Ladakh regions had 49 and 4 assembly seats, respectively. This is not correct because Kashmir had 46 assembly seats and Ladakh had 5 assembly seats.
Option D is incorrect because it states that Kashmir and Ladakh regions had 49 and 8 assembly seats, respectively. This is not correct because Kashmir had 46 assembly seats and Ladakh had 5 assembly seats.