Explicit goes in the blank. :)
The answer would be D.
In the story, it shows that he leaned his basic numbers by helping his father count and sort the rocks, hinting that he didn’t have the time to go to school and had to learn things on his own, in his own way :)
His prayers with the word, is what that mean so is this what your looking for ?
One benefit is that it can help you take notes and study