Which of the following statements is a part of the cell theory

I would say either C or D beside A say most living things are made of cells. No, all living things have cells. And B is right but C or D makes more sense.
Answer:
E. A, B and C only.
Explanation:
The cell theory was formulated by Theodor Schwann, Matthias Schleiden, and Rudolph Virchow. It consist of 3 major components:
Options A, B, and C are in accordance with the cell theory.
Hence, the correct option is E.