(B) . Misch metal is a well-known alloy which consists of a lanthanoid metal $(Ln)$ $(\approx 95\%)$,iron $(Fe)$ $(\approx 5\%)$,and traces of sulfur

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$Ln + Fe + \text{traces of } S, C, Al, \text{and } Ca$

(B) . Misch metal is a well-known alloy which consists of a lanthanoid metal $(Ln)$ $(\approx 95\%)$,iron $(Fe)$ $(\approx 5\%)$,and traces of sulfur $(S)$,carbon $(C)$,silicon $(Si)$,aluminum $(Al)$,and calcium $(Ca)$.Therefore,the most appropriate option representing the composition is $Ln + Fe$.