Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Electromagnets are made of soft iron.
Reason R: Soft iron has high permeability and low retentivity.
In the light of above statements, choose the most appropriate answer from the options given below.

Assertion A: Electromagnets are made of soft iron. This is true — soft iron is the standard core material for electromagnets.

Reason R: Soft iron has high permeability and low retentivity.

High permeability means soft iron gets magnetized very easily when placed in a magnetic field. Low retentivity means it loses its magnetism quickly when the magnetizing field is removed.

These are exactly the properties needed for an electromagnet — it should magnetize strongly when current flows, and demagnetize immediately when current stops.

Both A and R are correct, and R correctly explains why soft iron is used for electromagnets (high permeability for strong magnetization, low retentivity for easy demagnetization).

Therefore, the answer is Option C.