What is a tool? In the broadest sense, a tool is anything to do a job. In this sense, pens and pencils are writing tools, spades and hoes are gardening tools. But usually, "tools" refers to such things as hammers, saws, and drills. What is the main idea of the paragraph ........ A. The kinds of tools. B. The group of tools. C. The invention of tools. D. The meaning of tools.