Which of the following best explain why the lower course of a river is sometimes chocked with sediments? 1. The valley of a river is widest in its lower course. 2. The velocity of a river in its lower course is low. 3. The delta sometimes develops in a rivers lower course. 4. Much of the river water is drawn for irrigation in the lower course. Select the correct answer using the codes given below

• A.  1, 2, 3 and 4
• B.  1, 3 and 4
• C.  1, 2 and 3
• D.  2 and 4