Number of atoms in 558.5 g Fe (at.wt of Fe=$55.85gmol^{-1})$ is

Question

$\begin{array}{1 1}(a)\;6.023\times 10^{22}& (b)\;\text{twice that of 60g carbon} \\(c)\;\text{half that in 8g He}& (d)\;558.5\times 6.023\times 10^{23}\end{array}$