The volume of a rectangular box (or cuboid) whose length, breadth and height are 7 cm, 3 cm and 3 cm respectively, is.

The correct option is B $63c{m}^3$
Given:
Length of the rectangular box = 7 cm
Breadth of the rectangular box = 3 cm
Height of the rectangular box = 3 cm

$\therefore \text{The volume of the rectangular box}$
$=length\times breadth\times height$
$=7\times 3\times 3$
$=63c{m}^3$