Answer:
Parent's education level is the Lurking Variable
Step-by-step explanation:
Variables relationship are a crucial part of the research. Independent variable(s) are the variable(s), which determine the change in level of Dependent Variable. Dependent Variable is the variable, which is being effected by Independent Variable(s). Lurking Variable is a variable, which effects both independent & dependent variables, causes a spurious relationship between them.
Given Research Study : 'Affect of nutritious meal (breakfast) on grade level'. Nutritious value of breakfast is the Independent variable, affecting grade. And, the resultantly determined Grade Level is the Dependent Variable. Parent's education level effects both dependent variable (children's grade level) & independent variable (breakfast nutrition). So, Parent's education Level is the Lurking Variable.