A particle moving with a uniform acceleration along a straight line covers distances a and b in successive intervals of p and q second. The acceleration of the particle is:

• A

  $\frac{\mathrm{pq}\left(\mathrm{p}+\mathrm{q}\right)}{2 (\mathrm{bp} - \mathrm{aq})}$

• B

  $\frac{2(\mathrm{aq}-\mathrm{bp})}{\mathrm{pq}(\mathrm{p}-\mathrm{q})}$

• C

  $\frac{\mathrm{bp}-\mathrm{aq}}{\mathrm{pq}(\mathrm{p}-\mathrm{q})}$

• D

  $\frac{2\left(\mathrm{bp}-\mathrm{aq}\right)}{\mathrm{pq}(\mathrm{p}+\mathrm{q})}$