The Kinetic energy associated with a jet through a cross sectional area ‘a’ having density $$\rho$$ and velocity ‘v’ is

A

$$\frac{1}{2} \rho a v^{2}$$

B

$$\frac{1}{2} \rho a v^{3}$$

C

$$\frac{1}{2} \rho a^{2} v^{3}$$

D

$$\frac{1}{2} \rho v^{2}$$