Travis wanted more than anything to get a new computer. When he got one, he would finally be able to use software to compose music. All summer, he worked hard at his part-time job and saved money. In fact, he did nothing but work all the time. Finally, he had enough money and bought the computer. But when he tried to use software, he realized that he knew next to nothing about music composition. He decided to take some free classes at school, while the computer sat unused for another year. Which statement best expresses a theme of this story?

A. Some people don't know where their real talents lie.
B. Focusing on nothing but work can make a person unhappy.
C. Working hard is more important than having fun hobbies.
D. To reach a goal, a sensible plan is as important as hard work.