Which of the following describes the structure of the text as a whole?

A
a step-by-step description of the process that epidemiologists use to contain the spread of an unknown disease.

B
a cause-and-effect text that analyzes in detail the causes of an outbreak of an illness and its effect on the community.

C
a problem-solution structure that describes the outbreak of a disease and the steps taken to control, investigate, and end it.

D
a comparison of the symptoms, treatments, and tactics used in order to investigate and control two outbreaks of an unknown disease.