The ratio of the radii of the planets ${\mathrm{P}}_1$ and ${\mathrm{P}}_2$ is $\mathrm{a}$. The ratio of their accelerations due to gravity is $\mathrm{b}$. The ratio of the escape velocities from them will be

• A

  $\mathrm{ab}$
• Correct answer
  B

  $\sqrt{\mathrm{ab}}$
• C

  ${\mathrm{ab}}^2$
• D

  ${\mathrm{a}}^2\mathrm{b}$

Hence, the correct answer is option: 'B'.