Answer:
Option B
Step-by-step explanation:
In the sentence You will not be able to perceive any difference in the cells until you observe them under a microscope perceive means observing any difference in the cell.
Now since difference in cells can be determined when viewed through eyes using a microscope.
hence, here perceive means to see or notice
Option B is correct
Option A is incorrect as by reading the sentence we do not get any essence of making or doing something. Like wise option C is also incorrect
Option D could have been correct if the word microscope would not have been used. Hence, option D is also incorrect