The daily rising and setting of the stars is caused by
a. the rotation of the earth on its axis
b. the revolution of the earth about the sun
c. the tilt of the earth
d. the seasons

The important part here is "daily" - so we can ask, what else happens daily? the seasons, which are caused by the tilt of the earth and the Earth's rotation around the Sun, are on a yearly schedule rather than a daily schedule. What happens on a daily basis is one rotation of the Earth on its axis - and the correct answer is a)