Solve
-The Amount of a Radioactive Substance Present, in Grams $t$

Multiple Choice

Solve.
-The amount of a radioactive substance present, in grams, at time $t$ in months is given by the formula $y = 8000 ( 3 ) ^ { - 0.3 t }$ . Find the number of grams present in 4 years. If necessary, round to three decimal places.

A) $0.001 \mathrm {~g}$
B) $2140.644 \mathrm {~g}$
C) $214.064 \mathrm {~g}$
D) $0.000 \mathrm {~g}$