If M is the molar concentration of [tex]C_6H_{12}O_6[/tex], n is the number of moles and V is the volume of the solution:
[tex]M=\dfrac{n}{V}\Longrightarrow 4.5=\dfrac{n}{1.5}\iff n=4.5\times1.5\iff \boxed{n=6.75~moles}\\\\6.75\approx6.8\Longrightarrow Answer~C[/tex]
