Lily Proposes a Research Study in Her Research Methods Course

Lily proposes a research study in her Research Methods course. The instructor tells her that she needs to revise her study because it currently has mono-operation bias. What does this mean?

A) She is utilizing the operational definition of the construct as the definitive of the construct.
B) She is using only one operational definition of a variable and needs more.
C) She is relying on only one method and needs more.
D) She needs to do mixed methods research.