Two vessels separately contain two ideal gases A and B at the same temperature, the pressure of A being twice that of B. Under such conditions, the density of A is found to be $1.5$ times the density of B. The ratio of molecular weight of A and B is :

Question

( A ) $\frac{1}{2}$
( B ) $\frac{3}{4}$
( C ) 2
( D ) $\frac{2}{3}$