How Do Bulk-Forming Laxatives Work to Relieve Constipation

How do bulk-forming laxatives work to relieve constipation?

A) They absorb liquid in the colon to help form a bulky stool and stimulate evacuation.
B) They absorb liquid in the small intestine to help form a bulky stool and stimulate evacuation.
C) They inhibit existing bacteria in the bowel from growing,promoting fluid absorption and easier evacuation.
D) They inhibit the absorption of fluid in the intestines to allow for stimulation of a bowel movement.