The side of the cubical box is 1/2 foot, so its volume is given by,
[tex]\begin{gathered} \text{Volume of cubical box=(side)}^3 \\ \text{Volume of cubical box=(}\frac{1}{2}\text{)}^3 \\ \text{Volume of cubical box=}\frac{1}{8} \\ \text{Volume of cubical box=0}.125 \end{gathered}[/tex]Given that the container can be filled with 378 boxes.
So the volume of the container is given by,
[tex]\begin{gathered} \text{Volume of Container=378}\times\text{ Volume of a single box} \\ \text{Volume of Container=378}\times\text{ 0}.125 \\ \text{ Volume of Container}=47.25 \\ \text{Volume of Container}=47\frac{1}{4} \end{gathered}[/tex]Thus, first option is the correct choice.