The correct answer is: Uttar Pradesh.
Haryana shares its eastern border with Uttar Pradesh. The two states are separated by the Yamuna River. Haryana is located in the northern part of India, while Uttar Pradesh is located in the central part of the country. Haryana is a smaller state than Uttar Pradesh, with a population of about 25 million people. Uttar Pradesh is the most populous state in India, with a population of about 200 million people.
The other options are incorrect. Delhi is a union territory, not a state. Rajasthan is located to the west of Haryana, and Uttarakhand is located to the north.