Answer: B. They used tools to kill animals.
Step-by-step explanation:
The hunter gatherers were early humans who used to gather collectively to hunt big animals. The spears, bows and arrows made hunting and killing of animals easier. They kill animals to feed themselves. The scraping tools were used by these early humans to clean animal skin and the skin they used to make clothing and their own shelter. Harpoons were sharp pointed tools which were used to catch fishes.