In arc welding, the electric arc is produced between the work and the electrode by

Answer: Option D

Arc welding is a fusion welding process where heat is generated to melt and join metals.

The electric arc is created between the electrode and the workpiece, which produces intense heat.

Voltage is responsible for initiating and maintaining the arc gap between the electrode and the workpiece.

Flow of current provides the energy required to sustain the arc and generate heat for melting the metal.

Contact resistance at the point of initial contact helps in momentarily generating heat, which assists in the arc initiation.

Therefore, all these factors — voltage, current flow, and contact resistance — contribute to producing the electric arc in arc welding.

Hence, the correct answer is Option D: All of these.