In a medical study, it is found that the concentration C, in milligrams per liter (mg/L) of a certain medication in the bloodstream is modeled after

In a medical study, it is found that the concentration C, in milligrams per liter (mg/L) of a certain medication in the bloodstream is modeled after the function

C(t) = 6t/t^2 + 2

where t is the time in minutes after the medication is administered.

After how many minutes, to the nearest tenth of a minute, does the concentration of the medication in the bloodstream drop below 0.5 mg/L?

A. 0.2

B. 1.0

C. 2.0

D. 11.8