Why do people in eastern Germany awaken earlier, on average, than those in western Germany? A. The sun rises earlier in eastern Germany. B. Eastern Germany is in a different time zone. C. A gene that...

Why do people in eastern Germany awaken earlier, on average, than those in western Germany?
A. The sun rises earlier in eastern Germany.
B. Eastern Germany is in a different time zone.
C. A gene that inactivates melatonin is more common in eastern Germany.
D. A gene that inactivates melatonin is more common in western Germany.