Answer:
C.Use a microscope to observe the shapes of the bacteria.
Step-by-step explanation:
Bacteria is a type of pathogenic micro-organisms. They are mostly known to cause diseases and can be viewed using an electron microscope.
Bacteria have different shapes and colors. The shapes include bacilli(rod shaped), cocci(spherical)or spirilla( twisted).
The most useful strategy will be to use a microscope to observe the shapes of the bacteria.