A suspension of glass beads in ethylene glycol has a hindered settling velocity of $1\mathrm{.}7$ mm$/$s$,$ while the terminal settling velocity of a single glass bead in ethylene glycol is $17$ mm$/$s$.$ If the Richardson$-$Zaki hindered settling index is $4\mathrm{.}5,$ the volume fraction of solids in the suspension is

$0\mathrm{.}1$

$0\mathrm{.}4$

$0\mathrm{.}6$

None of these