The correct answer is option A and C.
The two factors which determine the amount of incoming solar radiation at a given location on the earth are the number of daylight hours and the angle of the sun's rays.
A definite equilibrium exists between the solar radiations and the earth's system.
Not all the radiation falling on the earth are absorbed some of them go back in to the space and in this way an equilibrium is maintained.
The amount of solar radiations travelling all the way from sun to earth depends on the angle of sunlight and daylight hours.
Other factors include weather patterns, climate and latitude and seasonal changes due to earth's rotation on its axis.
Simply put, some regions are located at right angle to the sunlight and thus receive more incoming solar radiations which readily heats up the surface of the earth while other regions are far located having steeper angles and thus receiving less amount of sunlight.
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