Answer:
C is the correct answer.
Explanation:
Hello, you want to ask two sisters so it cannot be A or D, as this is not plural.
B is not plural neither, just a formal way to say 'you'.
<u>C is the correct answer.</u>
'Vous' refers to the two sisters.
Comment vous appelez-vous?
Hope this helps.
Do not hesitate if you have any questions.
First of all: I cannot see the entire problem.
Second: This is posted in the wrong category. You have posted it in the French category, while clearly you have a Mathematical problem to deal with.
I would suggest changing the category so that people like me would be able to help you. I wish you all the best!
The letter I in French is pronounced like the “e” in “me.”