If you are looking for the def. of the word enlightened— it would be D - Knowledgeable. Enlightened means having knowledge.
The central idea is how Tan discusses to support the idea about how childhood language is good expression.
<h3>What is Central idea ?</h3>
Central idea serves as the main point of the excerpt that the author is try to pass across to the audience.
Therefore, the Central ideal rotate around the importance of childhood language and the impact on children.
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Something that is argueable is debateable.
The answer would be the 1st option.
- Folk Cronholm was spying for the Allied nations.