Explanation:

Introduction:
To do work, we need energy. Energy is the ability to perform work or cause changes in matter. It is a fundamental concept in physics and is required for any kind of work to be done.

Work and Energy:
Work is defined as the transfer of energy from one object or system to another. In order to do work, energy is needed. Work is done when a force is applied to an object and the object is displaced in the direction of the force. The amount of work done is equal to the product of the force applied and the distance over which the force is applied.

Force and Energy:
Force is a push or pull that can cause an object to move, stop, or change direction. It is required to do work, but it is not sufficient on its own. Force is a vector quantity, which means it has both magnitude and direction. It is measured in units called newtons.

Energy, on the other hand, is the ability to do work or cause changes in matter. It can exist in various forms such as kinetic energy, potential energy, thermal energy, chemical energy, etc. Energy is a scalar quantity, which means it only has magnitude and no direction. It is measured in units called joules.

Hands and Muscles:
While hands and muscles are required to apply force, they are not the primary factors needed to do work. They are the tools or means by which force is applied, but energy is the essential requirement.

Conclusion:
In conclusion, the correct answer is option 'B' - energy. Energy is the fundamental requirement to do work, while force, hands, and muscles are the means by which work is done. Without energy, no work can be performed, regardless of the presence of force, hands, or muscles.