A Sample of 700 Grams of Radioactive Substance Decays According $A(t)=700 e^{-0.034 t}$

Multiple Choice

A sample of 700 grams of radioactive substance decays according to the function $A(t) =700 e^{-0.034 t}$ , where $t$ is the time in years. How much of the substance will be left in the sample after 30 years? Round your answer to the nearest whole gram.

A) $2213 \mathrm{~g}$
B) $0 \mathrm{~g}$
C) $1 \mathrm{~g}$
D) $252 \mathrm{~g}$