Carbon-14 Dating Is a Useful Tool for Determining the Age

Multiple Choice

Carbon-14 dating is a useful tool for determining the age of the artifacts of ancient civilizations. However, when future archeologists study ruins of our civilization, they obtain confusing results -- with some artifacts dating MUCH older than others. Which of the following would be an explanation for these results?

A) Variations in the Sun's intensity and production of cosmic rays.
B) Ecosystem changes resulting in a reduction in carbon based life.
C) The use of petroleum based synthetic materials.
D) None of the choices.