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Math·Advanced Math·Nonlinear functions

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A sample of a certain isotope takes $29$ years to decay to half its original mass. The function $s(t)=128(0.5{)}^{\frac{t}{29}}$ gives the approximate mass of this isotope, in grams, that remains $t$ years after a $128$-gram sample starts to decay. Which statement is the best interpretation of $s(58)=32$ in this context?

A

Approximately $32$ grams of the sample remains $58$ years after the sample starts to decay.

B

The mass of the sample has decreased by approximately $32$ grams $58$ years after the sample starts to decay.

C

The mass of the sample has decreased by approximately $58$ grams $32$ years after the sample starts to decay.

D

Approximately $58$ grams of the sample remains $32$ years after the sample starts to decay.