A car travels along a straight road with uniform acceleration. Oil drips from the car at a rate of one drop every two seconds. The diagram illustrates the separations between three consecutive oil drops on the road. The distances shown are $9.0\,\text{m}$ and $12.0\,\text{m}$. Determine the acceleration of the car.
- A$0.75\,\text{m s}^{-2}$
- B$1.5\,\text{m s}^{-2}$
- C$3.0\,\text{m s}^{-2}$
- D$6.0\,\text{m s}^{-2}$