Which of the following does not favour the formation of deltas?

The existence of large lakes in the middle and lower portions of a river does not favor the formation of deltas. A delta is a landform that is formed at the mouth of a river where it flows into an ocean, sea, or lake. As the river reaches its mouth, it slows down and deposits sediment that it has carried from its upper course. Over time, these sediments accumulate and form a delta. A long upper course of a river and a lot of sediments in the lower course of a river both favor the formation of deltas because they provide a large amount of sediment that can be deposited at the river mouth. A reduction in river velocity at its lower course is also important because it allows the sediment to settle and accumulate. However, the existence of large lakes in the middle and lower portions of a river can prevent the formation of deltas because they can trap sediment before it reaches the river mouth. Sediment may be deposited in the lake instead of being carried to the river mouth, where it would be deposited to form a delta. Therefore, the presence of large lakes along the course of a river can interfere with the formation of a delta.