A) All living organisms are composed of cells.
B) The cell is the basic unit of structure and function in living organisms.
C) All cells arise from pre-existing cells.
D) Cells can form from non-living matter.
For Explanation Click Here:
The cell theory states that all living organisms are made up of cells, cells are the basic unit of structure and function, and all cells arise from pre-existing cells. The idea that cells can form from non-living matter is not part of the cell theory and is an outdated notion known as spontaneous generation.