Which of the screwdrivers listed is designed with the shaft made from double coil wire or tightly coiled steel?

Correct Answer: Option C — Flexible shaft

Flexible shaft screwdrivers utilize a tightly coiled steel wire core that transmits torque while allowing the shaft to bend around obstructions. This specialized tool is essential for accessing fasteners in confined, awkward spaces within machinery spaces where a rigid screwdriver cannot maintain proper alignment with the screw head.