If three distinct numbers are in geometric progression (G.P.) and the equations (ax² + bx + c = 0) and (px² + qx + r = 0) have a common root, then which one of the following statements is correct?

a) (bq - 2ar = 0)
b) (ap - 2bq = 0)
c) (cp - 2ar = 0)
d) (ar - 2cp = 0)