Two particles are executing simple harmonic of the same amplitude (A) and frequency `omega` along the x-axis . Their mean position is separated by distance `X_(0)(X_(0)gtA). If the maximum separation between them is (X_(0)+A), the phase difference between their motion is:
A. `(pi)/(4)`
B. `(pi)/(6)`
C. `(pi)/(2)`
D. `(pi)/(3)`