If the chord joining the points where x=...

If the chord joining the points where x=p, x=q on the curve `y=ax^(2)+bx+c` is parallel to the tangent to the curve `(alpha, beta)(` then `alpha=`

A

2pq

B

`sqrt(pq)`

C

`(p+q)/(2)`

D

`(p-q)/(2)`

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The correct Answer is:

C

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