Solve
-In Recent Years, Many States Have Passed Laws Against $\mathrm{N}$

Solve.
-In recent years, many states have passed laws against smoking in public buildings. The total number of states $\mathrm{N}$ that have passed a no smoking in public buildings law, $\mathrm{t}$ years after 1985 is given by the function
$\mathrm{N}(\mathrm{t}) =\frac{50}{1+19 \mathrm{e}^{-0.4 \mathrm{t}}}$
How many states had passed the law in 1985 ?

A) 2.5
B) 1.25
C) 0.25
D) 0