**Category:** Mechanics  
**Subtype:** Harmonic Motion  
**What the problem is about:** Identifying the correct order of graphs representing displacement, velocity, and acceleration as functions of time for a harmonic oscillator.

**Summary:** A student is studying the simple harmonic motion of a particle along the x-axis, with the origin (O) at the equilibrium position. The problem involves determining the correct sequence of graphs that depict how displacement (x), velocity (v), and acceleration (a) change over time (t). The options provided are different arrangements of these graphs.