Answer:
b. They increased chances for survival
Explanation:
The survival of the human species over time came as man managed to create new forms of access to food, such as hunting and agriculture. In the early days, when human livelihoods were based on gathering and hunting, the development of tools enabled man to increase his chances of survival. This is explained because the tools increased hunting productivity and enabled man to hunt at a safer distance from animals. For example with the bow and arrow.
