The phenomena of light involved in the formation of rainbow are :

According to the NCERT textbook (Section 10.4), a rainbow is a natural spectrum caused by the dispersion of sunlight by tiny water droplets in the atmosphere. The water droplets act like small prisms. They first refract and disperse the incident sunlight, then reflect it internally, and finally refract it again when it comes out of the raindrop.

• Option B is correct because it accurately lists the three key phenomena in sequence: refraction, dispersion, and internal reflection.
• Option A is incorrect because it mentions simple reflection instead of internal reflection, and misses the specific sequence of dispersion.
• Option C is incorrect because it omits the initial refraction of light entering the droplet.
• Option D is incorrect because scattering is not involved in the primary formation of a rainbow, and the textbook specifically terms the reflection inside the droplet as 'internal reflection' rather than 'total internal reflection'.