Question

How did the advent of the microscope most likely affect the foul-air theory?

Answer 1

C. It allowed scientists to see small organisms in sick individuals and change the theory.

Step-by-step explanation:

Answer 2

the answer for this question is: It allowed scientists to see small organisms in sick individuals and change the theory.
A lot of biological process/mechanism that happened around us could only be explained if we observe it on a smaller scale.
The advent of microscope allows scientists to observe a lot of things, such as the activity of virus, the movement of cells, the pores, etc.