Light Reflects Off the Surface of Lake Superior $180 ^ { \circ }$

Light reflects off the surface of Lake Superior. What phase shift does it undergo?

A) $180 ^ { \circ }$
B) $0 ^ { \circ }$
C) $90 ^ { \circ }$
D) $270 ^ { \circ }$
E) It does not undergo any phase shift.