If `a= (tan theta)/(tan 3theta)`, then the point `P(a, a^2)` (A) necessarily lies in the acute angle between the lines `y=3x and 3y=x` (B) may lie on line `3y=x` or `y=3x` (C) necessarily lies in the obtuse angle between the lines `3y=x` and `y=3x` (D) `aepsilon (1/3, 3)`