If the amount of daylight is caused by the tilt of the earth's axis, then what determines the amount of daylight earth gets?

Answer choices:
- Heat energy
 - The darkness it gets
 - The bending of a ray of light
 - The tilt of the axis
 - The tilt of the sun's axis
 - electromagnetic energy
 - The brightness of the earth
 - rain or sun shine

 

    The tilt of the axis      