Is this to help people feel better and be happy?
I haven’t learned that yet sry
the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
Hunter-Gatherers were nomadic tribes who relied on moving to different locations in search of fertile hunting/gathering grounds. Sometimes, these lands they explored were barren, while some were plentiful, but the key was to keep moving, so they could not stay in the fertile land for long.
Eventually, humans started to farm, and domesticate animals, which led into the Neolithic Era (civilization). Farming gave humans the assurance of constant food, and furthermore, set more social roles and behavioral standards for communities. However, this transition caused the loss of equality for different people in a community, and raised the style of living we know, with the establishment of classes and governments.
I believe C is the right anwser
