In direct characterization character's personality is explicitly described. Indirect characterization on the other hand uses dialogue, actions and other non-explicitly descriptions. Fro the given sentences the following sentence is example of direct characterization:
The door opened and in came ridiculous Reginald, as dapper and debonair as ever.
The novel uses first-person narration to show Grendel’s perspective.
Rosaleen seems to change because the environment also changed. now she is with black females. Here, she had not the threat of white men who used to beat her up when she tried to exercise her civil right. lily noticed her sudden change as soon as she entered the house, while crossing the yard even though she was walking under the rain.
Central ideas are the most IMPORTANT ideas in a text.
They are the central, unifying and definite themes or ideas of an article or story. They cover all the aspects that are needed in order to create a main idea that is coherent. Without a central idea the text would not be coherent as it could addres different topics that have nothing in common, making it senseless. In an essay the central ideas are supported by the arguments, for example a central idea could be: Bees are important for our planet. In that case supporting ideas can be: They pollinate flowers. They make honey.
As you can see they are the spine and base of the text.
Answer: A
Explanation: I personally would say the answer is A but it could very well be D. Depends if you take it in a literal or metaphorical sense.