Option 1: Narmada, Krishna, Godavari - This option is incorrect. The Narmada River originates from the Amarkantak region, but neither the Krishna nor the Godavari River have their sources in this region. The Krishna River originates from the Mahabaleshwar region in the Western Ghats, while the Godavari River originates from the Brahmagiri hills in Maharashtra.

Option 2: Son, Mahanadi, Narmada - This option is correct. The Narmada River does have its source in the Amarkantak region. The Son River, which is a tributary of the Ganges, also originates from the Amarkantak region. However, the Mahanadi River does not have its source in the Amarkantak region. It originates from the Sihawa hills in Chhattisgarh.

Option 3: Godavari, Krishna, Cauvery - This option is incorrect. None of these rivers have their sources in the Amarkantak region. The Godavari River originates from the Brahmagiri hills in Maharashtra, the Krishna River originates from the Mahabaleshwar region in the Western Ghats, and the Cauvery River originates from the