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
• 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