A point charge of magnitude $2.0{\text{ }}\mu {\text{ C}}$ is moved between two points X and Y. Point X is at a potential of $+ 6.0{\text{ V}}$ and point Y is at a potential of $+ 9.0{\text{ V}}$. The gain in potential energy of the point charge is

A.     $0.20{\text{ }}\mu {\text{J.}}$

B.     $1.5{\text{ }}\mu {\text{J.}}$

B.     $6.0{\text{ }}\mu {\text{J.}}$

B.     $30{\text{ }}\mu {\text{J.}}$

C