Protists Use Cilia to Move Within Their Habitat, but Ciliated

Multiple Choice

Protists use cilia to move within their habitat, but ciliated human cells like those in the bronchi are always anchored to one another and to an extracellular matrix; what benefit does cilia provide these cells?

A) Ciliary movement can dislodge infective bacteria before they permanently fasten to the plasma membrane.
B) The oxygen content of the extracellular fluid can be increased by agitation with cilia.
C) Ciliary movement can create currents that move secretions like mucus over the surface of a tissue.
D) all of the above