Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
-In 1990, the population of a country was estimated at 4 million. For any subsequent year the population, $\mathrm { P } ( \mathrm { t } )$ (in millions) , can be modeled by the equation $\mathrm { P } ( \mathrm { t } ) = \frac { 240 } { 5 + 54.99 \mathrm { e } ^ { - 0.0208 \mathrm { t } } }$ , where $t$ is the number of years since 1990 .
Estimate the year when the population will be 21 million.

A) approximately the year 2088
B) approximately the year 2016
C) approximately the year 2093
D) approximately the year 2041