Sonalika and Kalyan Sona are varieties of:

The correct option is: C

Explanation of the correct option:

1. Sonalika and Kalyan Sona are the high-yielding and disease-resistant varieties of wheat which were introduced all over the wheat-growing belt of India in 1963.
2. Sonalika and Kalyan Sona are the semi-dwarf varieties of wheat, popularly known as Mexican wheat, produced by Dr. Borlaug in Mexico in 1963.
3. India imported it and then modified it to produce several wheat varieties such as Sonalika and Kalyan Sona and as a consequence, wheat production increased from 11 million tons to 75 million tons.

Explanation of the incorrect option:

Option A:

1. Millets are a group of highly variable small-seeded grasses, widely grown around the world as cereal crops or grains for fodder and human food.
2. Eg: pearl millet, silver millet, etc.
3. There are very few hybrid varieties of millets compared to wheat and rice because of long negligence on the hybrid projects related to millets or shorghum.
4. However, several high yielding varieties resistant to water stress have been developed recently.

Option B:

1. A plant with leaves that have high levels of the addictive chemical nicotine.
2. After harvesting, tobacco leaves are cured, aged, and processed in various ways. The resulting products may be smoked, applied to the gums, or inhaled.
3. GT-4, GT-5, PL-5, etc are few of the hybrid varieties of tobacco.

Option D:

1. Rice is a Kharif crop that requires high temperatures (above 25 °C) and high humidity.
2. It requires an annual rainfall above 100 cm.
3. In areas with less rainfall, it grows with the help of irrigation.
4. IR-8, Taichung native-1, jaya, ratna, etc are few hybrid varieties of the rice.

Final answer: Sonalika and Kalyan Sona are varieties of wheat.