Narmada River has its source at:

Option 1 -> Brahmagiri is the source of Kaveri River in Karnataka, not Narmada.

Option 2 -> Satpura is a mountain range through which Narmada flows, but not its source point.

Option 3 -> Amarkantak plateau in Madhya Pradesh is the origin point of Narmada River.

Option 4 -> Western Ghats are source regions for rivers like Godavari and Krishna, not Narmada.

Hence, Option 3: Amarkantak -> The Narmada River originates from the Amarkantak Plateau in the Anuppur district of Madhya Pradesh at an elevation of about 1,057 meters. It is one of the major west-flowing rivers of peninsular India, flowing through a rift valley between Vindhya and Satpura ranges before emptying into the Arabian Sea. -> correct