The common difference in the A.P $\large\frac{1}{1+\sqrt y},\frac{1}{1-y},\frac{1}{1-\sqrt y},$...... is ________

Question

$\begin{array}{1 1}(A) \; \large\frac{1-y}{\sqrt y}\\(B)\;\large\frac{1+y}{\sqrt y} \\(C)\;\large\frac{\sqrt y}{1-y} \\(D)\;\large\frac{\sqrt y}{1+y} \end{array}$