If the volume of the below given cuboid is 120 cu units, then its height is units.

The correct option is A 30
Volume of a cuboid
= $\text{Area of the base}\times \text{height}$
= $(4\times h)$ cu units
= $4h$ cu units

But, the volume of the given cuboid is 120 cu units.

$\therefore 4h=120$
$⟹h=\frac{120}{4}=30$ units

Thus, the height of the given cuboid is 30 units.