The correct answer is A. low.
A squirrel-cage induction motor is an AC electric motor that has a rotating magnetic field that induces a current in the rotor, causing it to rotate. The starting torque of a squirrel-cage induction motor is low because the rotor is not initially aligned with the stator magnetic field. As the rotor rotates, it becomes more aligned with the stator magnetic field, and the starting torque increases. However, the starting torque of a squirrel-cage induction motor is still relatively low compared to other types of motors, such as synchronous motors.
Option B is incorrect because the starting torque of a squirrel-cage induction motor is not negligible. Option C is incorrect because the starting torque of a squirrel-cage induction motor is not the same as full-load torque. Option D is incorrect because the starting torque of a squirrel-cage induction motor is not slightly more than full-load torque.