The correct answers are B) temperature and C) precipitation.
The other options of the question were A) vegetation. D) land formations. E) geographical locations.
The traits that are used to classify the six major climate regions are temperature and precipitation.
According to scientific researchers and experts, the six major climate regions are the Mild Mediterranean, the cold region of the Tundra, Arid Zones, Damp Tropical regions, Polar climates-extremely cold, and Temperate regions. That is why the two elements that scientists used to classify these climate regions are the average precipitation per year and the average temperature during the months of the year.