What type of parent material primarily constitutes the Indus plains in Pakistan, having been carried by the Indus River and its tributaries from the Himalayas?

Explanation

The Indus plains are mainly formed from alluvial deposits transported by the Indus River and its tributaries originating in the Himalayas. The given options such as glacial debris (till), moraine, and colluvial material do not correctly describe the parent material of these plains. Therefore, the correct answer is 'None of the above.'