Final answer:
The location with 30 inches of annual rainfall and an average annual temperature of -10°C is categorized as a polar region. This is due to its low temperature, which is a defining characteristic of polar climates. option 3 is the correct answer.
Step-by-step explanation:
A location with 30 inches of annual rainfall and an average annual temperature of -10°C would most closely fall into the category of the polar region. The conditions described are too cold for an arid region, not warm enough for a tropical region, and the precipitation is higher than what we would typically find in a humid region.
Considering the climatic conditions mentioned, it is critical to recognize that polar regions, such as the Arctic tundra, are characterized by low temperatures and precipitation levels. With average annual temperatures well below freezing and the type of precipitation described, this location's characteristics are consistent with a polar climate rather than an arid, humid, or tropical one.
Therefore, given the options provided, the correct option answer in the final answer is (3) Polar region.