Students at Glenmont High School Spend Nine Hours a Day

Multiple Choice

Students at Glenmont High School spend nine hours a day at school, five days per week, while students at Ridgewood High School only spend seven hours a day at school, five days per week. On a recent test, students at both high schools had the same scores in math and reading. Therefore, Glenmont High School could reduce the amount of time students spend in class without reducing the quality of instruction in all subjects.
The argument above is most vulnerable to criticism on the grounds that it

A) Equates the value of math scores with reading scores.
B) Compares two things which are not similar enough to warrant comparison.
C) Presumes, without providing justification, that math and reading scores are always constant.
D) Presumes, without providing justification, that what is true for some subjects is true for all.
E) Confuses the quality of instruction with time spent in a classroom.