Atoms of element B form hcp lattice and those of the element A occupy $\large\frac{2}{3}^{rd}$ of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

Question

$\begin{array}{1 1}(A)\;A_2B_3&(B)\;A_4B_3\\(C)\;AB&(D)\;\text{None of these}\end{array}$