Theory of Structures - Engineering

Q1:

Pick up the correct statement from the following:

A
Hoop strain of the walls of a cylinder due to liquid is

B
Longitudinal strain in the walls of a cylinder due to liquid is

C
Volumetric change in the cylinderdue to liquid is

D All the above.

ANS:D - All the above.

Can you explain to me, why Option C is also correct? Explain the answer in detail.