In his research, john is trying to evaluate the quality of writing on 800 blogs. he has decided to define "quality" as the number of comments that each blog receives. so the more comments a blog receives, the higher john rates its quality. in psychology, the way that john has decided to measure quality is called

Operational definition

Explanation:

An operational definition is known as or referred to as articulation of statement of procedures i.e. operationalization, which is used in order to  define the terms of a process which are further needed in order to determine or find nature of a phenomenon or an item and their properties that are  extension, duration, quantity, chemical composition, etc. Since we know that degree of operationalization tends to vary, thus it can conclude in a less or more operational definition.

the correct answer is c.