Which of the Following Statements Is(are)correct About the Algae

Multiple Choice

Which of the following statements is(are) correct about the algae?

A) They are a diverse group of photosynthetic organisms.
B) They range in size from microscopic single cells to giant,complex,multicellular organisms.
C) They occupy the base of food chains in both freshwater and marine ecosystems.
D) They have been used as food for humans throughout the world.
E) All of the above are correct.