$\int\;\large\frac{a\sin x+6}{cos^2x}$$dx$

Question

$(A)\;a\tan x+6\sec x+c\qquad(B)\;a\sec^2x+6\tan^2x+c\qquad(C)\;a\sec x+6\tan x+c\qquad(D)\;(a+b)\tan^2x+c$