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 low.3. The delta sometimes develops in a river's lower course.4. Much of the river water is drawn for irrigation in the lower course.

Which of the following best explain why the lower course of a river is

1.	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 low.3. The delta sometimes develops in a river's lower course.4. Much of the river water is drawn for irrigation in the lower course.
A.	1, 2, 3 and 4
B.	1, 3 and 4 only
C.	1, 2 and 3 only
D.	2 and 4 only
Answer» D. 2 and 4 only