The unit hydrograph is estimated by the following table:

A storm produces the excess precipitation of $1\mathrm{.}1in.$ during the first hour, followed by $2\mathrm{.}5in.$ during the second hour. The stream discharge $(\frac{f{t}^3}{sec})$ at the end of the third hour is most nearly:

A$.155$

B$.210$

C$.350$

D$.185$