Answer:
A. Comparable in size to the Grand Canyon
Explanation:
Throughout the text, the Monterey Canyon is compared to the Grand Canyon several times, even stating that is has a larger size. This makes it incredibly misterious in many ways, such as the sealife that exists in its depths, the canyon's historical origins and the behavior of water currents that flow underneath its surface. All these characteristics have made it the focus of intense study for many years.
