Atmospheric circulation (heat transport): Without which large-scale process would the equator be much hotter and the poles much colder than observed? Identify the overarching concept that redistributes energy meridionally. Choose the correct option.

Concept/ApproachThe climate system reduces equator-to-pole contrasts via latitudinal heat redistribution accomplished by atmospheric circulation (Hadley/Ferrel cells, jet streams) and ocean currents. The best conceptual label among the choices is Option A; options B and C are specific atmospheric mechanisms within that broader process.

Final AnswerLatitudinal redistribution of heat