In 2011,the Educational Testing Service (ETS)charged $49 to Take the Scholastic

In 2011,the Educational Testing Service (ETS) charged $49 to take the Scholastic Aptitude Test (SAT) but $160 to take the Graduate Record Exam (GRE) .One reason for this difference in price is

A) more people took the SAT than the GRE in 2011.
B) the GRE is a longer test with more questions.
C) an average,those who take the GRE have higher incomes than those who take the SAT.
D) the ETS faces competition in the market for the SAT but no competition for the GRE.

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