Answer:
You have not given any background information about the question yet from the look of it, it seems like a question about the ancient estate system in France prior to the French revolution.
So the most suitable answers are,
*B. French aristocrats belonged to the Second Estate.
*D. It was very difficult to change membership in an estate.
Step-by-step explanation:
Estate system was made up of clergy (the First Estate), nobles (the Second Estate), and peasants and bourgeoisie (the Third Estate).