I don't know if this is a multiple choice question or not, but I would contend that this passage from The Secret Garden foreshadows Colin's progressive recovery as a result of his friendship with the characters of Mary and Dickon. Mary has just arrived in his bedroom and has enthusiastically announced the arrival of the spring. Colin has become very excited and has asked Mary to open the windows. She has done so and is now addressing his cousin in those terms: "That's fresh air [...]". Encouraged by Mary's words, and eager to become as strong as Dickon, Colin starts breathing deeply and repeatedly, and he soon feels that something pleasant is happening to him. The encounter with Mary, and later on with Dickon, is giving Colin energy and hope, and is turning him into a happy and more extroverted boy.
