A Newspaper Reported That 41% of Students Who Had Taken

A newspaper reported that 41% of students who had taken calculus in high school had a college freshman year GPA (grade point average) of 3.2 or higher. The headline was "High School Courses Key to College Grades". One potential problem with this headline is

A) motivated students could have both taken calculus in high school and have a high GPA (3.2 or higher) in their freshman year in college.
B) the margin of error was not reported in the article, so the figure 41% may be very uncertain.
C) not all students with a freshman GPA of 3.2 or higher had taken calculus.
D) not all students who had taken calculus in high school had a freshman GPA of 3.2 or higher.

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