What term is used to describe the "organs" of a cell?

The term used to describe the "organs" of a cell is "organelles." Organelles are specialized structures within a cell that perform distinct processes essential for the cell's life and function, much like organs in a body carry out various functions vital for the organism's survival. Examples of organelles include the nucleus, which houses genetic material; mitochondria, which generate energy; and ribosomes, which synthesize proteins.

The other options serve different functions: cytoplasm refers to the gel-like substance within the cell membrane that contains organelles and is the site of many metabolic processes; the cell membrane is the outer boundary of the cell that regulates what enters and exits; and proteins are macromolecules that perform a variety of functions within the cell, but they are not structures themselves. Thus, "organelles" is the correct term relating to the structural components within a cell that facilitate its various functions.