Question

for which object would a geologist use carbon - 14 dating to determine age?
the bones of animals
rocks older than 50,000 years old
types of sedimentary rocks
parts of volcanic rock

Explanation:

Carbon - 14 dating is used for organic materials. Bones of animals are organic. Rocks (sedimentary, volcanic) are inorganic. Also, carbon - 14 dating has a practical limit (about 50,000 years), so rocks older than 50,000 years old are not dated using carbon - 14.

Answer:

The bones of animals