The correct answer is option 'B' - Om Parkash Dhankhar committee.

The Haryana government constituted the Om Parkash Dhankhar committee to find a solution to the problem of polluted water flowing in the Yamuna river. This committee was formed in response to the severe pollution levels in the river, which has been a matter of concern for both the state and central governments.

The committee is named after Om Parkash Dhankhar, who is a senior leader of the Bharatiya Janata Party (BJP) in Haryana. He has been given the responsibility to lead the committee and find effective measures to tackle the pollution in the Yamuna river.

The formation of this committee highlights the government's commitment to addressing the environmental challenges faced by the state, particularly in relation to water pollution. The polluted water flowing in the Yamuna river not only poses a threat to the ecosystem but also affects the health and well-being of the people living in the surrounding areas.

The committee will be tasked with conducting a detailed study of the causes of water pollution in the Yamuna river and identifying the sources of contamination. It will also assess the existing infrastructure and policies in place to manage the pollution and make recommendations for improvement.

Additionally, the committee will explore innovative solutions and best practices from around the world to effectively clean the polluted water. It will engage with experts, scientists, and stakeholders to gather insights and develop a comprehensive action plan.

The Om Parkash Dhankhar committee will play a crucial role in formulating strategies to prevent further pollution and restore the Yamuna river to its pristine state. The committee's recommendations will guide the Haryana government in implementing necessary measures and policies to combat water pollution and ensure the sustainability of the river.

Overall, the formation of the Om Parkash Dhankhar committee reflects the government's commitment to addressing the issue of polluted water in the Yamuna river and finding sustainable solutions for the benefit of the environment and the people.