In which region do the least seasonal temperature changes occur?

The correct choice highlights the equatorial region, which is characterized by its relatively stable and consistent temperatures throughout the year. This stability is primarily due to the consistent angle at which sunlight strikes the equator, resulting in minimal variations in solar energy input. Unlike regions further from the equator, such as temperate or polar zones, where seasonal changes can be significant due to varying angles of sunlight and solar intensity, the equatorial region experiences temperatures that are generally warm and humid year-round.

In essence, the climatic conditions in the equatorial region lead to less fluctuation in temperature over seasons, making it distinct compared to areas that experience marked seasonal shifts. This consistent warmth supports diverse ecosystems, such as tropical rainforests, where the lack of temperature extremes allows for a stable habitat for various species year-round.