Greg would like to provide a more effective controlling idea for his paper. Which sentence should replace sentence 8 to effectively state the controlling
idea of this paper?

A. Quite a bit of knowledge is needed to figure out how the best roller
coasters work.
B. Hard work, science, and having lots of other skills are needed to design

C. Roller coasters have to be fun, so the scientists who design and build
Designing an exciting roller-coaster ride involves imagination and creativity, but it also requires using science.

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