Which of the Following Is Not a Problem Associated with Extracting

Which of the following is not a problem associated with extracting mineral resources from the ocean?

A) Many of the mineral resources that are found in seawater are in low concentrations.
B) This can be extremely expensive given current technologies.
C) There might be ecological impacts associated with aquatic life.
D) There might be disagreement as to who has legal access and rights to certain resources.
E) There are no valuable mineral resources in the ocean.