Consider the First-Order Decomposition of a Molecules (Shaded Spheres)in Two

Consider the first-order decomposition of A molecules (shaded spheres) in two vessels of equal volume.What is the half-life of decomposition in vessel (b) relative to the half-life of decomposition in vessel (a) ?

A) half-life in vessel (b) /half-life in vessel (a) = 4:1
B) half-life in vessel (b) /half-life in vessel (a) = 2:1
C) half-life in vessel (b) /half-life in vessel (a) = 3:2
D) half-life in vessel (b) /half-life in vessel (a) = 1:1