Given below are two statements: One is lebelled as Assertion A and the other is labelled as Reason R. Assertion A: One loses a day when he/she crosses 180° longitude east to west. Reason R: The sun rises in the east and sets in the west and two places that are 15 degree of longitude apart have a difference of 1 hour. In the light of the above statements, choose the correct answer from the options given below