Answer:
The volume of the cylinder B is greater than that of cylinder A
Explanation:
To know which cylinder has the greater volume, we need to find the volumes of both cylinders.
The volume of a cylinder is given as:

CYLINDER A
Radius, r = 3 m
Height, h = 1.2 m
Volume, V, will be:

The volume is

CYLINDER B
Radius, r = 4 m
Height, h = 2.5 m
Volume, V, will be:

The volume is

The volume of the cylinder B is greater than that of cylinder A.