Explanation:

- Option 1: A variety of Maize

- Maize, also known as corn, is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago. Various high-yielding and disease-resistant varieties have been developed.

- Option 2: A variety of Barley

- Barley is a major cereal grain grown in temperate climates globally. It's used for animal feed, brewing beer and whiskey, and as health food.

- Option 3: A variety of Millet

- 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.

- Option 4: A variety of Wheat

- Wheat is a staple food used in the production of flour for bread, pasta, pastry, etc. Wheat varieties are developed for better yield and disease resistance.

Correct Answer: Option 4 - A variety of Wheat