Answer
Check below for the matching.
Work Step by Step
Bacteriology --> (f) bacteria
Phycology --> (e) algae
Mycology --> (b) fungi
Protozoology --> (d) protozoa
Parasitology --> (c) pathogenic helminthes and protozoa
Virology --> (a) viruses
These are the microorganisms studied in each field (and hence the naming of each field!)