The Narmada river in the Peninsular plateau flows westward with a remarkably straight channel. It is because the:

• A

  slope gradient in this part controls the river channel pattern.
• B

  river carries a huge amount of water which has created a straight channel course.
• Correct answer
  C

  river forms the boundary between the Central Highlands and the Deccan Plateau.
• D

  river flows through the trough of a rift valley inclined westward.

Hence, the correct answer is option: 'C'.