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Two simple pendulums having lengths $l_{1}$ and $l_{2}$ with negligible string mass undergo angular displacements $\theta_{1}$ and $\theta_{2}$, from their mean positions, respectively. If the angular accelerations of both pendulums are same, then which expression is correct?

• A
  $\theta_{1} l_{2}^{2}=\theta_{2} l_{1}^{2}$
• B
  $\theta_{1} l_{1}=\theta_{2} l_{2}$
• C
  $\theta_{1} l_{1}^{2}=\theta_{2} l_{2}^{2}$
• ✓
  $\theta_{1} l_{2}=\theta_{2} l_{1}$