Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.

Assertion (A): Radio waves bend in a magnetic field.
Reason (R): Radio waves are electromagnetic in nature.

Both Assertion (A) and Reason (R) are true statements:
Assertion (A) is true because radio waves are a type of electromagnetic wave and can be influenced by magnetic fields through a phenomenon called magnetic field refraction.
Reason (R) is also true because radio waves, like all electromagnetic waves, consist of oscillating electric and magnetic fields.

However, Reason (R) does not correctly explain why radio waves bend in a magnetic field. The bending of radio waves in a magnetic field is due to the interaction of the wave with the magnetic field lines, which affects the propagation direction but does not directly relate to the nature of radio waves being electromagnetic.

Therefore, the correct answer is Option B: Both (A) and (R) are true, but (R) is not the correct explanation of (A).