The correct answer is (d). Uttar Pradesh, Maharashtra, Bihar, and West Bengal are the four most populous states in India.
Uttar Pradesh is the most populous state in India, with a population of over 200 million people. It is located in the northern part of the country and is bordered by Nepal, Uttarakhand, Himachal Pradesh, Haryana, Rajasthan, Madhya Pradesh, Chhattisgarh, and Bihar. The capital of Uttar Pradesh is Lucknow.
Maharashtra is the second most populous state in India, with a population of over 110 million people. It is located in the western part of the country and is bordered by Gujarat, Madhya Pradesh, Chhattisgarh, Telangana, Karnataka, and Goa. The capital of Maharashtra is Mumbai.
Bihar is the third most populous state in India, with a population of over 100 million people. It is located in the eastern part of the country and is bordered by Nepal, Uttar Pradesh, Jharkhand, West Bengal, and Odisha. The capital of Bihar is Patna.
West Bengal is the fourth most populous state in India, with a population of over 90 million people. It is located in the eastern part of the country and is bordered by Nepal, Sikkim, Bhutan, Assam, Jharkhand, Odisha, and Bangladesh. The capital of West Bengal is Kolkata.
The other options are incorrect because they do not include one of the four most populous states in India.