The correct answer is D. All of these.
The Somb river, Pathrala river, and Budhi Ganga are all tributaries of the Yamuna river in the plains.
The Somb river is a tributary of the Yamuna river in the state of Uttar Pradesh. It originates in the Kaimur Range and flows through the districts of Mirzapur, Allahabad, and Kanpur. The Somb river joins the Yamuna river near the town of Etawah.
The Pathrala river is a tributary of the Yamuna river in the state of Uttarakhand. It originates in the Garhwal Himalayas and flows through the districts of Chamoli, Rudraprayag, and Haridwar. The Pathrala river joins the Yamuna river near the town of Haridwar.
The Budhi Ganga is a tributary of the Yamuna river in the state of Uttar Pradesh. It originates in the Kumaon Himalayas and flows through the districts of Nainital, Almora, and Pithoragarh. The Budhi Ganga joins the Yamuna river near the town of Haldwani.