Olive struggled in her primary math classes, but with hard work she developed into an advanced student of calculus by the time she was old enough to enter college.
Was Olive good at math at the end of high school?
Yes, Olive was good at math at the end of high school.
The sentence tells us that she worked hard and became good at calculus just before college, the time period during which students are finishing high school. The other responses do not indicate this.
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