Valeria Plans to Study the Influence of Students' Attachment to School

Valeria plans to study the influence of students' attachment to school on their educational outcomes.She defines attachment to school as how much students feel they are part of the school community and defines students' educational outcomes as their educational performance.She then measures students' feelings about belonging to the school community with specific questions about how much they think they matter to their teachers and to other students,ranging from "not at all important" to "very important." Educational performance is measured by the students' grade point average and by scores on standardized tests.In this study,"feeling part of the school community" and "educational performance" are examples of

A) measures.
B) concrete definitions.
C) operationalization.
D) hypotheses.