The great pacific garbage patch will be difficult to physically clean up because
a.
it lies in international waters
b.
no single nation is responsible for creating it
c.
filtering out the plastic will also remove plankton
d.
all of the above

Option D

Explanation: The Great Pacific Patch Garbage is difficult to be cleaned up because it is a very large area that contains debris that reaches the marine ecosystem.

It is located at the north central of the pacific ocean. The collection of the debris is primarily from the countries like Asia, Hawaii, California and extends to many other places too.

The pelagic area is characterized by high concentration of plastic, chemical sludge. Removing this will remove plankton present in pelagic  zone.