Correct option is A
The presence of air-gap between the stator and rotor of an induction motor increases the reluctance of the magnetic circuit.
Consequently, an induction motor draws a large magnetizing current (Im) to produce the required flux in the air-gap.
That is why the small air-gap is preferred for the induction motor which helps to reduce the magnetizing current.
If the air gap of an induction motor is increased,
The permeability of the magnetic circuit will decrease
The magnetizing inductance of the motor will decrease
Leakage reactance will increase
Leakage flux will increase
The magnetizing current will increase
This will cause a poorer power factor at all loads
