Answer:
D. complete agreement among scientist.
Step-by-step explanation:
The development of cell theory is given by three major scientist (Matthias Schleiden, Theodor Schwann and Rudolf Virchow). They gave three major principles which are as follows.
1. Every living thing in the world is build up of cells.
2. The most basic unit of life is cell.
3. Every cell come from already existing cell.