Which of the Following Statements About Protozoans Is True

Which of the following statements about protozoans is true?

A) They are unicellular eukaryotes that demonstrate animal-like characteristics in both food consumption and motility.
B) They only enter into parasitic relationships with a host.
C) They have cellular features like flagella, cilia and pseudopodia that help attain food and aid movement.
D) They may have complex life cycles alternating between cyst and trophozoite stages.