Answer:
d.
All of these
Explanation: all of these are ways that a person could be able to learn more. stay focused taking a break and come back to it after a brain rest is a very good way to help your brain only focus on one thing. trying to read the material out loud also helps because you might be more focused on the words. defining vocabulary words he does not understand in the section would also help so when you are reading group you really understand what it's saying. in conclusion, the answer is D. ALL OF THESE.
hope this helps!