JEE Math Practice Question

Let the circumcentre of a triangle with vertices A(a, 3), B(b, 5) and C(a, b), ab > 0 be P(1,1). If the line AP intersects the line BC at the point Q$$\left(k_{1}, k_{2}\right)$$, then $$k_{1}+k_{2}$$ is equal to :

1. A.2
2. B.$$\frac{4}{7}$$
3. C.$$\frac{2}{7}$$
4. D.4