Read the excerpt from The Boy Who Harnessed the Wind by William Kamkwamba. I spent the day combing through the books while Mrs. Sikelo graded papers at her desk. Despite the variety of titles, I left that afternoon with books on geography, social studies, and basic spelling—the same textbooks my friends were studying in school. It was the end of the term, and my hope was to get caught up before classes started again.

At home I planted a thick blue gum pole deep in the ground near the mango tree out front, then made my own hammock out of knotted maize sacks. For the next three weeks, I began a rigorous course in independent study, visiting the library in the mornings, and spending the afternoons reading in the shade.

What idea does the excerpt help develop?

A. The author is dedicated and studious.
B. The author is confused and overwhelmed.
C. The author is planting and caring for trees.
D. The author checks out many books.