Question

advance sunrise and delayed sunset

Answer 1

The sunrise is advanced due to the phenomenon of refraction of sunlight. The  observer on the earth will see the sun two minute before the sun reaches the horizon. The sunlight while entering the earth's atmosphere follow a curved path due to the atmospheric refraction before it reach the earth, due that bending, there is a delay of two minutes in sunrise and sunset.

Hence, the correct answer would be refraction of light

Answer 2

is

due to the refraction light from the sun when entering the earth's

atmosphere