The radial component of velocity and acceleration in curvilinear motion are

• A. \(\dot r\) and \(\ddot r-r(\dot \theta )^2\)
• B. \(r\dot\theta\) and \(r\ddot\theta +2\dot r\dot \theta\)
• C. 0 and \(\dot r\dot\theta\)
• D. \(\dot r\) and \(r\ddot\theta\)