The correct answer is: A. Ravi
The Tons is a tributary of the Ravi River in India. It originates in the Garhwal Himalayas in the Chamoli district of Uttarakhand state. It flows through the districts of Dehradun, Haridwar, and Ambala in Uttarakhand and Haryana states, respectively. It joins the Ravi River near Madhopur in Punjab state.
The Tons is a perennial river with a mean annual discharge of 1,200 cubic meters per second. It is a major source of irrigation for the agricultural fields in the states of Uttarakhand,
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