There is a destructive interference between the two waves of wavelength $\mathrm{\lambda }$ coming from two different paths at a point. To get maximum sound or constructive interference at that point, the path of one wave is to be increased by

• A

  $\frac{\mathrm{\lambda }}{4}$

• B

  $\frac{\mathrm{\lambda }}{2}$

• C

  $\frac{3\mathrm{\lambda }}{4}$

• D

  $\mathrm{\lambda }$