A monkey of mass $20\; kg$ is holding a vertical rope. The rope will not break when mass of $25\; kg$ is suspended from it. but will break if the mass exceeds $25\; kg$. what is the accelerations (maximum) with which the monkey can climb up along the rope. $(g=10 m/s^2)$

Question

$$(a)\;10\; m/s^2 \quad (b)\;2.5\; m/s^2 \quad (c)\;25\; m/s^2 \quad (d)\;5\;m/s^2$$