Consider the following statements about the crops of Rajasthan: a. Rajasthan is the highest producer of Bajara in the country. b. Kalyan Sona, Sonalika, Mangla are varieties of wheat. c. Ganganagar district is the leading district in the production of cotton in Rajasthan. d. Rajasthan ranks first in wheat producing states of India. Choose the most appropriate answer from the options given below: