If you search the Internet to find out how people form habits, you'll probably learn that it takes just 21 days to form a habit. Or maybe 18, or 28 or even 31. The numbers are different, but the standard advice is the same. Many experts suggest that if you simply repeat a behavior for a specific number of days, you're destined to develop the habit. Why did the author include this paragraph?

A
to demonstrate the belief that habits are a matter of destiny and timing, not choice
B
to outline the best place to find information about how to form a habit
C
to highlight the idea that one key to habit formation is repetition over time
D
to introduce the idea that experts cannot agree on what forms a ha