The correct answer is: Groundnut.
Gujarat is the leading producer of groundnut in India. In 2020-21, Gujarat produced 10.2 million tonnes of groundnut, which was about 30% of the total production in India. The other options are rivers, not crops.
Narmada is a river in central India. It is the fifth-longest river in India and the largest river in Gujarat. The Sharavathi is a river in Karnataka. It is the third-longest river in Karnataka. The Mahi is a river in Gujarat and Rajasthan. It is the longest river in Gujarat. The Tapi is a river in Gujarat and Maharashtra. It is the second-longest river in Gujarat.
Groundnut is a legume crop that is native to South America. It is a major source of edible oil and protein. Groundnut is also used to make a variety of products, such as peanut butter, peanut oil, and peanut flour.