Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in petroleum have been in the ground for 325 million years, what fraction of the initial 14^C atoms is still there? (t1/2=5,730 yr)
A. 0
B. 2.2E-8
C. 9.6E-1
D. 1.0E0
E. 9.4E-1