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 and carbon - 14 dating is not effective for rocks older than about 50,000 years due to low levels of remaining carbon - 14.

Answer:

The bones of animals