Concept:The overhead (vertical) sun gives the most heat. The Tropic of Capricorn (2321∘ S) is in the southern hemisphere.Solution:The sun is overhead on the Tropic of Capricorn on about 22 December (December solstice).At this time the southern hemisphere is tilted towards the sun, gets more direct rays and longer days, so it has summer.At the same time the northern hemisphere has winter.Answer:Option C (Summer)