The answer is: a. what karla says, does, and thinks
The author presents to the reader Karla’s character by showing her thoughts and what she says and does.
For example, there is a part of the story where is thinking about how her cousin has nonverbal reactions “As Karla turned away from Jade and walked down the hall towards math class, she pictured her cousin shrugging her shoulders.”
In other we can also how she prevent herself from learning "It's something like math," she though silently, "but not exactly the same. I have to connect my brain to my body, and make it move or stop at exactly the right moment. The key here is to execute every movement skillfully."
