Answer:
c. equatorial.
Step-by-step explanation:
Of the three latitudes for which radiation curves are drawn, the one location that annually experiences two maxima and two minima periods of incoming solar radiation at the top of the atmosphere is the equitorial location. Equatorial location experiences two maxima and minima periods of solar radiation because during the solstice in both hemisphere (the Northern and Southern Hemisphere) solar radiation is reduced at the equator the June solstice or December solstice while the equator receives the maxima radiation during the equinoxes of March and September.