Large Potato-Sized Nodules Found on the Sea Floor Contain Manganese

Multiple Choice

Large potato-sized nodules found on the sea floor contain manganese, copper, and nickel. What is the main reason these minerals have not been mined?

A) it would cost more to mine the minerals than they are currently worth
B) international agreements for seafloor mining do not yet exist
C) nobody is really sure where these nodules are located
D) the metals are of limited use and abundantly available elsewhere
E) none of these statements is correct