The correct answer is: c) Flint
Flint is a type of sedimentary rock that is composed of microcrystalline quartz. It is a hard, brittle rock that can be easily chipped and flaked to create sharp edges. Flint was commonly used by prehistoric people for toolmaking, as it is a very versatile material that can be used to create a variety of tools, including knives, axes, and arrowheads.
Quartzite is a type of metamorphic rock that is composed of quartz. It is a hard, durable rock that is often used in construction. Granite is a type of igneous rock that is composed of quartz, feldspar, and mica. It is a hard, dense rock that is often used in building and landscaping. Obsidian is a type of volcanic glass that is composed of silica. It is a very hard, brittle rock that is often used to make knives and other cutting tools.
Flint is the most likely answer to the question because it is the most common type of stone that was used by prehistoric people for toolmaking. It is a hard, brittle rock that can be easily chipped and flaked to create sharp edges. Flint was commonly used to create a variety of tools, including knives, axes, and arrowheads.