The correct answer is: a) Maize
Maize is a cereal grain that is widely grown in Punjab. It is a good alternative to rice because it is less water-intensive and can be grown in areas with less rainfall. Maize is also a good source of protein and carbohydrates.
Basmati rice is a type of long-grain rice that is grown in Punjab. It is a popular variety of rice that is known for its flavor and aroma. However, basmati rice is a water-intensive crop and requires a lot of rainfall to grow.
Cotton is a fiber crop that is grown in Punjab. It is a major source of income for farmers in the region. However, cotton is a water-intensive crop and requires a lot of rainfall to grow.
Mustard is an oilseed crop that is grown in Punjab. It is a good source of oil and protein. However, mustard is not a major crop in Punjab and is not widely grown.
In conclusion, maize is the best alternative to rice in Punjab because it is less water-intensive, can be grown in areas with less rainfall, and is a good source of protein and carbohydrates.