The half-life of Cs-137 is 30.2 years. If the initial mass of the sample is 1.00 kg, how much will remain after 151 years?

A. There will be 0.062 kg left after 151 years.
B. There will be 2.000 kg left after 151 years.
C. There will be 0.031 kg left after 151 years.
D. There will be 0.500 kg left after 151 years.