Angle swept by a particle in a circular path is given by $=(4t^2+3t-2)$ rad, where $t$ is time in seconds. Angular speed of the particle at $t=2s$ will be

A$.24ra\frac{d}{s}$

B$.7ra\frac{d}{s}$

C$.19ra\frac{d}{s}$

D$.12ra\frac{d}{s}$