Question

At 180 degrees longitude, the __________ represents the point at which the Eastern and Western Hemispheres experience different days.
A.
Equator
B.
Prime Meridian
C.
Tropic of Cancer
D.
International Date Line

Answer 1

I believe it is D. International date line, because the question holds the answer. When you say "Different days" it kind of gives the answer away. 

Hope this helps :)

Answer 2

D.
hope this helps!!!