If two light waves reaching at a point produce destructive interference,then the condition of phase difference is:

• A
  $0, 2\pi, 4\pi, 6\pi, \ldots$
• B
  $\frac{\pi}{4}, \frac{\pi}{2}, \frac{3\pi}{4}, \ldots$
• C
  $\frac{\pi}{2}, \frac{3\pi}{2}, \frac{5\pi}{2}, \ldots$
• D
  $\pi, 3\pi, 5\pi, \ldots$