Conclusion:

"math educators in this country seem to have it backward,

emphasizing in higher grades the same narrow, skills-based approach that students learned in lower grades rather than the analytical tools they will need to solve complex math problems. "

Which of the following, if true, would most seriously weaken the conclusion drawn above?

(A) While music is common in elementary school curriculums, it is rarely taught in high school.

>>>out of scope

(B) On international tests of math skills, high-school students in this country performed no worse than did their counterparts from countries where problem-solving is emphasized in higher grades.

>>>Weakens

(C) When presented with a math problem to solve, students in higher grades are more likely to arrive at different answers than students in lowers grades are.

>>>Does not weaken or strengthen

(D) Older students tend to receive higher grades in math than do younger students.

>>>Strengthen

(E) Universities in this country report a steady increase in the percentage of native first-year students who qualify to take advanced mathematics courses such as calculus.

>>>weakens

Between B and E, I choose B because it is more in context with the conclusion drawn esp:emphasis in problem solving in lower and higher grades

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