The canal that was dug to re-channel water to the everglades failed to improve the wetland habitat because a. the water was too saline b. the water came too fast c. the water brought more alligators d. the water was too polluted.

The answer to this question is letter B. The came too fast.
During the 20th century the canal water efforts to create major changes in South Florida landscape. The leeve-canal in Evergrade failed to improve the wetland habitat, a canal was constructed to drain and reclaim the wetlands.