Answer:
b. They are the most important ideas in a text.
d. They are supported by details.
e. They can be explicitly stated or implied.
The central ideas of a text are those that are most important. The rest of the text is built around these main ideas. Main ideas also tend to be supported by details which expand on their information and claims. Finally, main ideas can be either explicitly stated or implied, without altering their importance and relevance to the text.
