The correct answer is: a) Wheat and barley.
Wheat and barley were among the earliest domesticated crops in Punjab. They were first domesticated in the Fertile Crescent, a region of the Middle East that includes parts of modern-day Iraq, Iran, Syria, Turkey, Jordan, Lebanon, and Israel. Wheat and barley are both members of the grass family, and they are both used to make bread, pasta, and other food products.
Rice and millet were also domesticated in the Fertile Crescent, but they were not domesticated in Punjab. Rice is a grass that is native to Asia, and it is the most widely consumed cereal crop in the world. Millet is a group of grasses that are native to Africa, Asia, and Europe. They are used to make flour, porridge, and other food products.
Maize and potatoes were domesticated in the Americas. Maize is a grass that is native to Mexico, and it is the most widely consumed cereal crop in the Americas. Potatoes are a tuber that is native to the Andes Mountains of South America. They are used to make chips, french fries, and other food products.
Cotton and sugarcane are both tropical crops that are not native to Punjab. Cotton is a fiber that is used to make clothing, and sugarcane is a plant that is used to make sugar.