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The correct answer is option 1 - 1 only.
The question asks which of the given rivers join the Yamuna river. From the options, we can see that option 1 states that only the Betwa river joins the Yamuna river.
To understand this, let`s look at the individual rivers mentioned in the question:
1. Betwa - This is a river that flows through the states of Madhya Pradesh and Uttar Pradesh in India. It is a tributary of the Yamuna river. Therefore, option 1 is correct in stating that the Betwa river joins the Yamuna river.
2. Kosi - The Kosi river is a tributary of the Ganges river. It does not join the Yamuna river. Therefore, option 2 is not correct.
3. Gandak - The Gandak river is also a tributary of the Ganges river and it does not join the Yamuna river. Therefore, option 3 is not correct.
Hence, the correct answer is option 1 - 1 only.