Correct option is A
A transformer at no-load (meaning, when its secondary winding is open, and there is no load connected to it) primarily behaves like an inductor.
When AC voltage is applied to the primary winding of a transformer with no load connected to the secondary, a small current, known as the no-load current flows in the primary winding.
This current is necessary to magnetize the core and is responsible for creating the magnetic field that links the primary and secondary windings.
