Seasons are celebrations. A year's a Ferris wheel. Both honor our world's habit of spinning 'round a star. 18. Which one of the following sentences best expresses the main idea of this poem? A. Seasons and Ferris wheels are like Earth's journey around the sun. B. There are four seasons in a year. C. The world has a habit of spinning around. D. Season are celebrations, while a year on Earth is a habit.