(B) The magnetic moment $(\mu)$ is calculated using the formula $\mu = \sqrt{n(n+2)} \text{ BM}$,where $n$ is the number of unpaired electrons.For $3d

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(B) The magnetic moment $(\mu)$ is calculated using the formula $\mu = \sqrt{n(n+2)} \text{ BM}$,where $n$ is the number of unpaired electrons.For $3d^2$,$n = 2$.For $3d^5$,$n = 5$.For $3d^7$,$n = 3$.For $3d^9$,$n = 1$.Since $3d^5$ has the maximum number of unpaired electrons $(n=5)$,it exhibits the highest magnetic moment.