11. Charge on Top. Consider a closed, empty cone with radius $r$, height $h$, and slant height $l$, placed in a region with uniform electric field as shown. A proton is placed above the tip of the cone as shown in the figure. What is the net electric flux through the cone?
A. $\frac{-|e|}{\epsilon_0(\pi r^2 + \pi rl)}$
B. $\frac{|e|}{\epsilon_0(\pi r^2 + \pi rl)}$
C. zero
D. $\frac{|e|}{\epsilon_0}$