In a class of 60 students,30 opted for NCC,32 opted for NSS and 24 opted for both NCC and NSS.If one of these student students is selected at random,find the probability that the student has opted NSS but not NCC

Question

$\begin{array}{1 1}(A)\;\large\frac{2}{15}\\(B)\;\large\frac{3}{15}\\(C)\;\large\frac{4}{15}\\(D)\;\text{None of these}\end{array}$