Answer:
Option B
Explanation:
Option C is not correct as disdain means considering something is not worthy of while in the given question referring some one as madam is a matter of showing respect.
If the villagers have lacked formal education, then they would have not called grandma as madam. Hence, option D is also incorrect
Option A is also not correct or we can say it is partially correct but calling some one madam just not justify "showing interest in someone"
Hence, option B is incorrect