[单选题]
Consider a particle of mqvr3 *;ft4r0 vf ;vrwbkd/.ltass- gwqvo8 vh3m8x0 vn3x $m$ and rest mass $m_0$. Which of the following is the correct expression for the kinetic energy of such a particle?
A. $\frac{1}{2} m_0 v^2$
B. $\frac{1}{2} m v^2$
C. $m c^2 - m_0 c^2$
D. $\frac{1}{2}(mc^2 - m_0 c^2)$
