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Statement $A\left(\right.$ Assertion) : If $\sin \theta=\frac{1}{2}$ and $\theta$ is acute angle, then $\left(3 \cos \theta-4 \cos ^3 \theta\right)$ is equal to 0.Statement R (Reason) : As $\sin \theta=\frac{1}{2}$ and $\theta$ is acute, so $\theta$ must be $60^{\circ}$.

• A
  Both assertion (A) and reason ( $R$ ) are true and reason $(R)$ is the correct explanation of assertion $(A)$.
• B
  Both assertion (A) and reason ( $R$ ) are true and reason $(R)$ is not the correct explanation of assertion (A).
• ✓
  Assertion $(A)$ is true but reason $(R)$ is false.
• D
  Assertion (A) is false but reason $(R)$ is true.