Cell theory is best described by the statement: "cell theory describes the process of how cells come from preexisting cells."
Cell theory encompasses three main points:
- All living organisms are composed of one or more cells.
- The cell is the basic unit of life.
- All cells arise from preexisting cells.
So, while your provided options are not perfectly phrased, the last option about cells coming from preexisting cells is the most accurate in relation to cell theory.