Answer: D) All of these.
Explanation: when we are trying to learn a material, there are several things that we can do to help us learn it faster. In the given example, after reading the section on elements within the water molecule three times, Harrison could take a break and come back to it after a brain rest (because this would give him time to process what he had read), define vocabulary words he does not understand in this section (in this way, he will completely understand the text) and finally he could try reading the material out loud (because sometimes this helps to pay more attention to what we are reading).
