RESEARCH STUDY 3.1 Anderson Is Reading His Morning Paper and Reads the Following

RESEARCH STUDY 3.1
Anderson is reading his morning paper and reads the following headline: "Female Engineering Majors' Effort on Math Problems Depends on Sex of Role Model." (This headline is based on a study conducted by Stout, Dasgupta, Hunsinger, and McManus, 2011.) In the study, female students were asked to complete a math test by either a male math major or a female math major. Female students tried to solve more of the math problems when asked by a female math major compared with a male math major.
-Refer to Research Study 3.1 above to answer the following question. In this study,the authors were interested in students' math effort.Which of the following would NOT be a reasonable operational definition of math effort?

A) An earnest attempt to solve math problems
B) The number of math classes taken in college
C) A score on a standardized measure of math effort
D) The number of math problems students answered correctly
E) All of the above are conceptual definitions