At two points P and Q on screen in Young's double slit experiment,

At two points $\mathrm{P}$ and $\mathrm{Q}$ on screen in Young's double slit experiment, waves from slits $\mathrm{S}_{1}$ and $\mathrm{S}_{2}$ have a path difference of 0 and $\frac{\lambda}{4}$ respectively. the ratio of intensities at $P$ and $Q$ will be :

(A) 

(B) 

(C) 

(D)