When and where is the intensity of insolation the strongest?

the tropic of cancer during winter solstice (december)
the tropic of cancer during summer solstice (june)
the tropic of capricorn during equinox
the equator during summer solstice (june)
the tropic of capricorn during summer solstice

intensity of insolation is strongest at Tropic of Cancer during summer solstice (June)

Explanation:

As solar intensity depends upon the availability of insolation throughout the day, angle of incidence and duration of day earth distance from the sun all are affected by this phenomenon. The longer periods of sunshine directly impact the amount of solar received at the surface of the earth. Places on the equator receive most of the solar radiation at a 90-degree angle throughout the year. The months of June to Sept see a huge amount of sun rays at the surface of the earth. June 21 marks the summer solstice hence the longest period of sunshine over the northern hemispheres.