Answer:
The correct answer is - c) Pathology.
Step-by-step explanation:
Mycology is the branch of biology in which students study fungi and their characteristics including their biochemistry, taxonomy, and genetics.
Agronomy is the other branch of biology that deals with agriculture and its practices and work to improve the crops.
Phycology is the study of algae and their characteristics including their biochemistry, taxonomy, and genetics.
The disease and its causes are studied under the pathology branch o biology therefore, red rust would be studying in this discipline.