题目内容
（请给出正确答案）
[主观题]
Since the average test score of students enrolled in charter schools were rising 7.5 perce
nt in the spring, many educators concluded that the system was working.
A．Since the average test score of students enrolled in charter schools were rising 7.5 percent in the spring, many educators concluded
B．As the average test score of students enrolled in charter schools rose 7.5 percent in the spring, with many educators concluding
C．Because the average test score of students enrolled in charter schools rose 7.5 percent in the spring, many educators concluded
D．Because the average test score of students enrolled in charter schools were up 7.5 percent in the spring, many educators concluded
E．With average test scores rising by 7.5 percent among students enrolled in charter schools, and many educators concluded
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