A circle C1 passes through the origin O and has diameter 4 on the positive X-axis. The line y=2x gives a chord OA of a circle C1. Let C2 be the circle with OA as a diameter. If the tangent to C2 at the point A meets the X-axis at P and Y-axis at Q, then QA:AP is equal to (2022 Main, 27 July II)
(a) 1:4
(b) 1:5
(c) 2:5
(d) 1:3