Which of the following statements best describes the function of a cell membrane? ( WILL MARK BRAINLIEST ) Please help ASAP

A. The cell membrane has many functions, but its primary action is to regulate the movement of materials into and out of the cell

B. The cell membrane has numerous functions, but its primary role is to keep organelles contained within the cell

C. The cell membrane has many functions, but its primary action is to act as a barrier to keep foreign substances from moving into the cell

D. The cell membrane's primary function is to move waste out of the cell