$(a)\;4\qquad(b)\;5\qquad(c)\;6\qquad(d)\;7$

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Density $\rho = \large\frac{Z\times at . wt}{V\times Av.no.}$

$\;\;\;\;\;\;\;\;\;\;\;\;=\large\frac{Z\times at.wt.}{a^3\times Av.no.}$

Z = 2 for b.c.c a = 287

pm = $287\times10^{-10}cm$

$\rho = \large\frac{2\times52}{(287\times10^{-10})^3\times6.023\times10^{23}}$

$\;\;\;\; = 7.3$

$\;\;\;\;= 7g\;cm^{-3}$

Hence answer is (d)

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