Invention of Microscope was the greatest step toward the discovery of cells.
Option C
Step-by-step explanation:
The major step anybody have taken in the cellular studies is the invention of microscope. ''Anton wen Leeuwenhoek'' is the first man who discover a cell with life under the microscope. The first cell which was taken under the vision of microscope in 1674 was of an algae. Microscope is the instrument which helps to see the organism in minute size under the clear lens, this helps the study of the cell easier because of which the tiny cell organelles were easier to study.