Read the Paragraph Below and Answer the Questions That Follow

Read the paragraph below and answer the questions that follow.
(1) Amateur stargazing is an interesting and rewarding hobby. (2) Exploring astronomy builds knowledge about our amazing universe. (3) It's an inexpensive pastime, too. (4) All that's needed is a telescope, a book about how to understand what you're looking at, and maybe a membership in an astronomical club. (5) Studying the night sky is free! (6) That's why astronomy is also a great family activity. (7) In fact, looking at the heavens may awaken a love of science in children. (8) Plus, those who star-gaze long enough might even make an important discovery. (9) After all, many amateur astronomers have discovered comets, asteroids, and other heavenly bodies. (10) In 2005, for example, two amateur sky-watchers in New Zealand discovered a new planet 15,000 miles from Earth using only a backyard telescope.
How many arguments support the topic sentence?

A) two
B) three
C) four