Answer : The correct option is,

Explanation :
Electromagnetic waves : It is defined as a wave where two vectors are vibrating mutually perpendicular to each other and in the direction of the wave. The two vectors are the electric field and the magnetic field.
The gamma-rays, x-rays, ultraviolet-rays, infrared-rays, microwaves and radio-waves are the electromagnetic waves.
The increasing order of electromagnetic waves in terms of wavelength will be,
The wavelength range of radio waves are,

The frequency range of radio waves are,

Therefore, the wavelength of radio waves is,

The electromagnetic waves spectrum are shown below.