$A$ mass of $1 \ kg$ is suspended by a string $A$. Another string $C$ is connected to its lower end as shown in figure. If a sudden jerk is given to $C$,then
- Athe mass will start rotating
- Bthe portion $A B$ of the string will break
- Cthe portion $B C$ of the string will break
- DNone of the string will break
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