Question

Let $a,r,s,t$ be nonzero real numbers. Let $P(a{t}^2,2at),Q,R(a{r}^2,2ar)andS(a{s}^2,2as)$ be distinct points on the parabola $y^2=4ax.$ Suppose that $PQ$ is the focal chord and lines $QR$ and $PK$ are parallel, where $K$ is the point $(2a,0).$

• A.
• B.
• C.
• D.

Answer 1

The correct option is B