A) 5
B) 6
C) 4
D) 3
Correct Answer: B
Solution :
\[\begin{align} & \,\,\,\,\,~\text{5 6} \\ & -\text{ }\underline{\text{3 5}} \\ & ~\,\,\,\,\,\,\underline{\text{2 1}} \\ \end{align}\]
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