Which option correctly lists the three main tenets of classic cell theory?

• A. All cells are eukaryotic; the nucleus is the basic unit of heredity; all organisms arise from pre-existing organisms.
• B. All cells contain a nucleus; all cells perform photosynthesis; all cells arise spontaneously from nonliving matter.
• C. All living organisms are composed of one or more cells; the cell is the basic unit of structure and function in organisms; all cells arise from pre-existing cells.
• D. All organisms are composed of tissues; tissues are the basic unit of life; all tissues arise from pre-existing tissues.

Answer: (C)