Convective Lifting is arguably the most common form of lifting and involves the heating of the Earth's surface such that surface water gets evapotranspirated from the ground and plants.
As the clouds rise, they encounter cooler temperatures and thus cool down and condense into clouds. Higher temperatures mean higher convection.
The Amazon lies on the Equator which receives the most direct sunlight so the surface gets heated a lot. Water therefore collects faster and condenses more over the Amazon which leads to more precipitation over the Rainforest.
B; As far as the relation between humans and the environment, it is obvious how much they relied on it. Not only as a food source, but for economic growth and sustainability as well. The other answers make valid points but in the context of this question, the only one that even mentions the relation is B.
