Three crops that contribute maximum global food production are
Triticum aestivum, commonly known as common wheat is a grass which is widely cultivated for its cereal grain which is a worldwide staple food. Oryza sativa, commonly known as rice is a cereal grain which is the most widely consumed staple food for a large part of the world's human population, especially in Asia. Zea mays, commonly known as maize the third most important cereal crop in the world. So, the correct answer is 'Wheat, Rice and maize'.