Let,

$M$ -mass of life

$v$- velocity of rifle

$m$ -mass of bullet

$u$ -velocity of bullet

$Mv=mu$

$\large\frac{K_r}{K_b}=\frac{\Large\frac{1}{2}Mv^2}{\Large\frac{1}{2}mv^2}$

$\large\frac{(Mv)^2}{(Mu)^2} $$\times \large \frac{m}{M}=\large\frac{m}{M}$

Since $m$ < $M$

$K_b \;>\;K_r$

Therefore $\large\frac{Kinetic\;energy\;of\;rifle}{Kinetic\;energy\;of\;bullet} \;< \;1$

Hence b is the correct answer.

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