Why Is the Humus Layer Typically Thicker in a Cool

Multiple Choice

Why is the humus layer typically thicker in a cool, temperate, forest soil than in a tropical rainforest soil?

A) Less humus is produced in the tropical rainforest because the B horizon is so poorly developed.
B) Less humus is produced in the cool, temperate forest but the rate of decay and oxidation is slower than in a tropical rainforest.
C) More humus is produced in the tropical rainforest, but it is quickly washed away by the heavy rains.
D) In a tropical rainforest, the forest-floor litter is often burned during the dry season.