The correct option is C B, A, D, C
There are two questions and two answers in this conversation. The key is to find which question comes first. Logically the person would first ask if he/she has any plans for the vacation, to which he/she replies that he/she is going to meet his/her cousin. The next question then would be about where the cousin lives, the answer to which is, a remote village in Himachal Pradesh. According to this pattern, option C is the correct answer, making options A, B and D incorrect.