B) Electrical Discharge Machining (EDM) has the lowest specific power requirement among the given non-traditional machining processes.

Electrical Discharge Machining (EDM) is a non-traditional machining process in which material is removed from a workpiece by a series of rapidly recurring electrical discharges between an electrode and the workpiece. The process involves creating an electrical spark between the electrode and the workpiece, which leads to the erosion of the material from the workpiece.

Specific power requirement refers to the amount of power required to remove a unit volume of material during the machining process. It is typically measured in watts per cubic millimeter (W/mm³).

Now, let's discuss why EDM has the lowest specific power requirement:

1. Principle of Operation:
- EDM operates based on the principle of thermal energy transfer. The electrical discharges generate intense heat, which melts and vaporizes the material from the workpiece surface.
- As the material is removed through thermal energy transfer, the specific power requirement is relatively low compared to other non-traditional machining processes.

2. Material Removal Mechanism:
- EDM uses a localized electrical discharge to remove material. It does not rely on mechanical forces or cutting tools.
- The electrical discharges cause the material to melt and vaporize, resulting in the removal of tiny particles from the workpiece surface.
- This material removal mechanism requires less energy compared to processes that involve significant mechanical forces or cutting actions.

3. Material Properties:
- EDM is effective in machining electrically conductive materials, such as metals and alloys.
- These materials have high melting and boiling points, which means they require a significant amount of energy to be removed through traditional machining processes.
- In EDM, the electrical discharges provide the necessary energy to melt and vaporize the material, resulting in a lower specific power requirement.

In conclusion, Electrical Discharge Machining (EDM) has the lowest specific power requirement among the given non-traditional machining processes. It operates based on the principle of thermal energy transfer, utilizes a material removal mechanism that requires less energy, and is particularly effective in machining electrically conductive materials with high melting points.