Which of these describes the experiences of many Chinese immigrants in California? A. They had to return to China after a year. B. They were highly successful gold miners. C. They were subjected to prejudice and abuse. D. They were respected for their ancient culture. I NEED HELP!

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.