How does the "Life in the wild" contribute to the author's argument in "Excerpt from Marine Mammals in Captivity"?

Incomplete question. I assumed you are referring to the article "Excerpt from Marine Mammals in Captivity" by The Humane Society of the United States.

Explanation:

In that section, the author provides real-life examples that back his claims about why animals should be taken from their natural wild habitat.

For example, the author stated, "The very nature of these animals makes them uniquely unsuited to confinement." He further continued by stating how Whales and Dolphins naturally love to travel long distances every day, "they are always aware, and  always moving."

The author made a lasting point by adding, "Understanding this, it is difficult to imagine the tragedy of life in no  more than a tiny swimming pool." With such expression the author no doubt causes the reader to think about the sudden changes experienced by these living organisms.  

A. Monopolized

Explanation:

It means relatively the same thing as dominated and it can easily replace (dominated).