Can someone check my answer worth 10 points and I think it is C Which describes a fault?

two plates coming into contact
cracks in Earth’s crust
*cracks in Earth’s mantle
cracks in Earth’s core

Suppose that sociologists and cultural anthropologists are tying to measure the amount of child abuse for cross cultural comparison. they run into disagreement over whether spanking a child is abuse or discipline. what problem are they encountering in their research? a. reliability of the definition of abuse. b. validity of the definition of abuse. c. occam's razor about the definition of abuse. d. none of these.