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In fig. 2; above, $MN$ is a light uniform metre rule plvoted at 0 , the $80\mathrm{cm}$ mark. A load of mass $3.0\mathrm{kg}$ is suspended on the, rule at $L_1$ the $1.0\mathrm{cm}$ mark. If the rule is kept in equilibrium by a string $p$, fixed at $p$ and attached to the rule at $\mathrm{R}$, the $20\mathrm{cm}$ mark, then the tension $T$ In the string is ____________

A. $25\mathrm{N}$
B. $50\mathrm{N}$
C. $250\mathrm{N}$
D. $5000\mathrm{N}$  
E. $25000\mathrm{N}$

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Correct Answer: D