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)>A)`. If the maximum separation between them is `(X_(0)+A)`, the phase difference between their motion is:
A. (a) `(pi)/3`
B. (b) `(pi)/4`
C. (c )(pi)/6`
D. (d) (pi)/2`