Which is the best way to revise this sentence for subject-verb agreement? please help 11 points to whoever helps
A. A superorganism are groups of organisms that behaves like a single organism.
B. A superorganism is a group of organisms that behaves like a single organism.
C. Superorganism are a group of organisms that behaves like a single organism.
D. Superorganisms is a group of organisms that behaves like a single organism.