Wave optics neet based question

Suppose p is polarising angle for a transparent medium and the speed of light in the medium is v. Then according to Brewster's law A. p=cot^-1 v/c      B. p=cos^-1 v/c    C. p=sin^-1 v/c    D. p=cosec^-1 v/c

Answer: A. p=cot -1 v/c  Please elaborate