The electric field vector of a wave is given as $$\overrightarrow{E}=E_{o} e^{j(\omega t + 3x - 4y)}\frac{8\overrightarrow{a_{x}}+6\overrightarrow{a_{y}}+5\overrightarrow{a_{z}}}{\sqrt{125}}  V/m$$. Its frequency is 10 GHz. The phase velocity in Y-direction will be

A

$$2 \times 10^{10} \frac{m}{s}$$

B

$$1.5 \times 10^{10} \frac{m}{s}$$

C

$$1.85 \times 10^{10} \frac{m}{s}$$

D

$$1.25 \times 10^{10} \frac{m}{s}$$