the formula $A=k^{Kt},$ A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant deternined by fhe nations of the material, A certain radioactive obope has a hall$-$ite of approximately $1,450$ years. How mary years would be required for a given amount of this isolope to decay lo $35\%$ of hal amoun? Round io fien rearnest rear.

A$.2,161y$

B$.2\mathrm{.}186y$

C$.901$ y

D$.9425$ yr