Q. Which of the following best explain why the lower course of a river is sometimes choked 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 low3 The delta sometimes develops in a river’s lower course.4 Much of the river water is drawn for irrigation in the lower courseSelect the correct answer using the code given below:Code:

1. 1, 2, 3 and 4
2. 1, 3 and 4 only
3. 1, 2 and 3 only
4. 2 and 4 only