Answer: B.) The Colorado River wears away land along the Grand Canyon.
Step-by-step explanation:
The Colorado river wearing away land along the Grand Canyon is how the Grand Canyon was formed in the first place when it did so for over 10 million years. Conservationists going against a natural process seems unlikely.
Conservationists have however, rallied against invasive species such as salt cedar trees. They have also fought against mining operations around the Grand Canyon and dam projects that have dried up some parts of the Colorado river.