A solid sphere rolls down without slipping on an inclined plane of angle of inclination $\operatorname{Sin}^{-1}\left(\frac{21}{50}\right)$. If the acceleration due to gravity is $10 \mathrm{~ms}^{-2}$, the acceleration of the rolling sphere is _________.

• Correct answer
  A

  $3 \mathrm{~ms}^{-2}$
• B

  $7 \mathrm{~ms}^{-2}$
• C

  $10 \mathrm{~ms}^{-2}$
• D

  $2 \mathrm{~ms}^{-2}$

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