[单选题]
Consider a particle of mass0wgw8ptdtus9 7o/ +xq cyom(9s dehfi 6mv):6$m$ 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. $\frac{1}{2}(mc^2 - m_0 c^2)$
