Answer: D.
Step-by-step explanation:
D. Humid conditions increase the nutrient content in the soil, which favors the growth of slow-growing trees.
Humid conditions are favorable to slow-growing trees because they create an environment with more available water and nutrients, allowing these trees to thrive. Additionally, humid conditions can reduce the rate of evaporation in the soil, allowing more moisture to remain in the environment and providing more resources for the growth of slow-growing trees.