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Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. The cell theory states

1) Cells are the building blocks of living organisms.

2) All living organisms are composed of cells and a cell is the basic structural and functional unit

3) All cells arise from pre-existing cells.

So, according to the cell theory, all living beings are made of cells and cells are the basic structural units of living beings. 

So, Option C is the correct answer.