The correct answer is: b) Rice, maize.
Bihar has a tropical climate with hot, humid summers and mild winters. The average temperature ranges from 20°C to 38°C. The rainfall is evenly distributed throughout the year, with the monsoon season from June to September receiving the most rainfall.
Rice and maize are both cereal crops that are grown in tropical and subtropical climates. Rice is a staple food in many parts of the world, including Asia, Africa, and Latin America. Maize is also a major food crop, and it is used to make a variety of products, including cornbread, tortillas, and popcorn.
Both rice and maize are relatively easy to grow, and they are tolerant of a wide range of soil types and climates. However, they do require a lot of water, so they are not suitable for growing in areas with low rainfall.
The other options are not suitable for cultivation in Bihar because they require a different climate. Wheat and barley are grown in temperate climates, while dates and oranges are grown in arid climates. Apples and cherries are grown in cool, temperate climates.