The correct answer is C. compressibility.
Compressibility is a measure of how much a substance can be compressed. It is defined as the reciprocal of the bulk modulus, which is the ratio of the pressure applied to a substance to the fractional change in volume that results.
The volumetric change of a fluid caused by a resistance is due to the compression of the fluid. The more compressible a fluid is, the more it will be compressed by a given resistance.
A. Volumetric strain is a measure of how much the volume of a material changes under stress. It is defined as the change in volume divided by the original volume.
B. Volumetric index is a measure of how much the volume of a material changes with temperature. It is defined as the change in volume divided by the original volume per unit change in temperature.
D. Adhesion is the force of attraction between two surfaces that are in contact. It is caused by the interaction of the molecules on the surfaces.