Correct Answer - Option 4 : Displacement
For simple harmonic motion, the equations are as given
x = A sinωt
ẋ = Aωcosωt
\(\begin{array}{l}
\ddot x = - {\rm{A}}{{\rm{\omega }}^2}{\rm{sin\omega t}}\\
\ddot x = - {{\rm{\omega }}^2}{\rm{x}}
\end{array}\)
⇒ Acceleration ∝ displacement.
