Correct option is C
Shading coils: In a shaded-pole motor, a shading coil is a short-circuited copper ring or coil placed on a part of the stator pole.
\Rotating magnetic field: When single-phase power is applied to the motor, the shading coil creates a slightly delayed magnetic flux in its shaded portion compared to the unshaded portion.
Resulting rotation: This difference in magnetic flux across the poles produces a rotating magnetic field, which is necessary for the motor to start and rotate.
