The volume of the box is given as:
where l is the length, w is width and h is the height. Plugging the values given we have that:
Now the volume of the dices are given by:
plugging the length given we have:
Now to find out how many dices fit in the box we divide the volume of the box by the volume of the dice, then we have:
Therefore we can fit 1920 dices in the box and the anwer is B.