The number of `C^(14)` atoms in a sample is 100 . The half- life period of `C^(14)` is 5730 year . The number of `C^(14) ` atoms in the sample after 5730 year.

Options

A. must be equal to 50
B. must be equal to 100
C. may be equal to 90
D. must be equal to 90

Answer

C