Greg would like to provide a more effective controlling idea for his paper. Which sentence should replace the following to effectively state the controlling idea? (Remember you don't want to change the meaning.)

a. Science and a lot of other things are needed to design a fun and working roller coaster.
b. Designing an exciting roller-coaster ride involves imagination and creativity, but it also requires using science.
c. Quite a bit of knowledge is needed to figure out how the best roller coasters work.
d. Roller coasters have to be fun, so the scientists who design and build them must know something about amusement parks.
e. Hard work, science, and having lots of other skills are needed to design popular roller coasters.

In order to provide a more effective controlling idea for the paper, the sentence that will replace sentence 8 is designing an exciting roller-coaster ride involves imagination and creativity, but it also requires using science. (Option B)

The controlling idea refers to the composition’s main idea that the writer is attempting to develop. It generally expresses a definite opinion or attitude about the topic of the composition. The controlling idea stems from the purpose and the subject of the composition. It provides the readers with a map of the text’s territory and a framework to interpret the specific material the text will present. It provides a basis of decision-making for the sentences and paragraphs as they should be directly related to the controlling idea. In the given case, as Greg wrote the paper about the science involved in designing roller-coaster rides, an effective controlling idea to replace sentence 8 would be option B.

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