Studies of Snapping Shrimp on Either Side of the Isthmus

Multiple Choice

Studies of snapping shrimp on either side of the Isthmus of Panama have shown that each Caribbean shrimp species is more closely related to a Pacific shrimp species than it is to any other Caribbean shrimp species.The most likely explanation for this result is

A) snapping shrimp in the Caribbean and the Pacific were never part of the same population.
B) snapping shrimp species in each ocean diverged prior to the formation of the Isthmus of Panama.
C) snapping shrimp species in each ocean diverged after the formation of the Isthmus of Panama.
D) creation of the Panama Canal allowed interbreeding between populations of shrimp.