If `(alpha,alpha^2)` lies inside the triangle formed by the lines `2x+3y-1=0,x+2y-3=0,5x-6y-1=0` , then (a) `2alpha+3alpha^2-1>0` (b) `alpha+2alpha^2-3<0` (c) `alpha+2alpha^2-3<0` (d) `6alpha^2-5a+1>0`