*PLEASE ANSWER!! ITS FOR MY EXAM* Which of the following describes non-algae plants?

a.) a genus of large brown seaweed that floats in island-like masses, called beds, and is common in waters off the U. S. South Atlantic coast

b.) a type of single-celled phytoplankton that lives ubiquitously throughout the upper strata of the ocean

c.) seagrasses which exist in the shallow coastal regions that are somewhat hybrid in nature because they have adapted to the high salt content of ocean water