An object having the capability to do work is said to possess A. Inertia B. Force C. Pressure D. Energy

The correct answer is D. Energy.

Energy is the ability to do work. It is a fundamental property of matter and energy is always conserved. Energy can be converted from one form to another, but it cannot be created or destroyed.

Inertia is the resistance of an object to any change in its motion. It is a property of matter and is not a form of energy.

Force is an interaction between two objects that causes a change in motion. It is a vector quantity, meaning that it has both magnitude and direction.

Pressure is a force per unit area. It is a scalar quantity, meaning that it has only magnitude.

In conclusion, the correct answer is D. Energy.