A $-3\mathrm{.}00\%$ grade intersects a $+2\%$ grade at Sta. $50+30$ and elevation $210\mathrm{.}00ft.$ A $600-$ft vertical

curve connects the two grades. The elevation of the lowest point $($turning point$)$ is most nearly:

A$)210\mathrm{.}00$

B$)211\mathrm{.}54$

C$)215\mathrm{.}25$

D$)226\mathrm{.}36$