When a character walks and talk in a certain way, it reveals a lot about their character. For example, if a character were to walk very energetically and quickly with no shame, they may have confident character traits.
This is a little bit tricky to justify without context, but I would say that this is an example of characterization. Through this sentence, the reader isn’t directly being told something about the character or her personality, but her sleeping with the letter under her cheek can help the reader make inferences about how, for instance, she treats things that are important to her.
D. None of these because they don't start with the same letters.
The best answer is that a linear array helps someone organize synonyms or antonyms by letting him/her organize words according to nuance of meaning. Nuance of meaning by definition is a slight difference in meaning.
Hope my answer has come to your help.