⁹⁰Sr Is a Particularly Dangerous Nuclide Formed from the Fission

⁹⁰Sr is a particularly dangerous nuclide formed from the fission of ²³⁵U in atomic bombs because it can readily enter the food chain by replacing calcium in plants or animals. If the rate constant for the decay of ⁹⁰Sr is 0.0274 yr^-1, approximately how long will it take for 99.0% of a sample of ⁹⁰Sr to decay?

A) 168 years
B) 52.0 years
C) 452 years
D) 195 years
E) none of the above