The writer wants to change sentence 3 (reproduced below) to provide a more specific preview of the passage’s argument. While previous theories speculated that people can only acquire a new language at a young age, new research supports a different perspective.

Which of the following pieces of information is most appropriate for the writer to include in the new version of the sentence?

C. An overview of the new study’s claim that optimal language acquisition can occur up to age 30 and that even older adults should remain hopeful about their language-learning prospects

Explanation:

Answer C

Correct. By providing an overview of what the new study is claiming, the writer can more specifically preview the line of reasoning of the passage’s argument that language acquisition can be successful at older ages.

A brief statement or account of the main points of something is called Summary.