Solve the Problem $$A = - \frac { \ln P } { 0.000121 }$$

Multiple Choice

Solve the problem.
-Carbon dating determines the approximate age of an object made from materials that were once alive by measuring the remaining percentage of a radioactive isotope, carbon-14. The age is calculated using the formula
$$A = - \frac { \ln P } { 0.000121 }$$
where $P$ is the percentage of remaining carbon-14 (in decimal form) . A specimen is determined to be 2,800 years old. What is the percentage of remaining carbon-14? Round to the nearest tenth of a percent.

A) $71.3 \%$
B) $51.3 \%$
C) $84.3 \%$
D) $31.3 \%$