Final answer:
The Amazon rainforest's primary climate is tropical and humid, featuring warm temperatures and consistent high rainfall throughout the year. This climate supports its diverse and evergreen vegetation.
Step-by-step explanation:
The primary climate of the Amazon rainforest is best described as tropical and humid. This biome, located in equatorial regions, is typified by warm temperatures throughout the year and a high level of precipitation. Thus, the correct answer to the question is c) Tropical and humid. The Amazon Basin is characterized by a Type A climate which includes various subgroups indicating the variability of rainfall distribution throughout the year. Some areas have a distinct wet and dry season, while others, like the Amazon rainforest, receive consistent rainfall year-round. This climate supports the lush evergreen vegetation of the tropical rainforest, making it the most diverse terrestrial biome and critical for its rich biodiversity and potential for new drugs derived from its unique flora and fauna.