B. Avril is dyslexic, which means she has trouble understanding what she reads.
Explanation:
This statement provides details that elaborate on the main idea that the writer exposes, he admires his sister, because she has a learning disability and still she is the hardest-working student he knows, and if you add to that the fact that she has dyslexia it can give a more profound meaning to the fact that she is doing well in school.
Explanation: Because in the passage it tells you that Avril has a learning disability and she works hard, which means the author is just telling how Avril is hardworking.
