At the end of Chapter 5 of "The Pearl" by John Steinbeck, Kino decides to take the pearl to the capital. His intention is to sell it in hopes of achieving a better life for his family, particularly for his son Coyotito. This decision comes after significant turmoil and crisis in his life, making the pearl both a symbol of hope and potential danger. Therefore, the correct answer is:
C. He decided to take it to the capital.