The three-dimensional arrangement of electron groups around the central atom is called
a. electron-pair repulsion
b. electronegativity
c. electron-group geometry
d. geometric design

Tundra biomes have extremely low temperatures and characterized by permafrost so B is not the answer. Taiga biomes are just below tundra biomes so it is still characterized by low temperatures so A is not the answer. Tropical areas experience hotter climates than temperate areas. Thus, C is the correct answer.