Find the Flux of the Curl of Field F Through $\pi$

Multiple Choice

Find the flux of the curl of field F through the shell S.
-F = -7zi + 6xj + 5yk; S is the portion of the cone z = 3 below the plane z = 1

A) - 1/3 $\pi$
B) - 4/3 $\pi$
C) - 2/3 $\pi$
D) 4/3 $\pi$