Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
-The concentration of a drug in the bloodstream, measured in milligrams per liter, can be modeled by the function, $C ( t ) = \frac { 12 t + 4 } { 3 t ^ { 2 } + 2 }$ , where $t$ is the number of minutes after injection of the drug. When will the drug be at its highest concentration? Approximate your answer rounded to two decimal places.

A) $t = 3.65$ minutes after the injection is given
B) $t = 4$ minutes after the injection is given
C) $\mathrm { t } = 0.55$ minutes after the injection is given
D) at the time of injection