Read the following sentence from the passage.
When people try to empty their minds of thoughts, they discover how full of thoughts their minds are.
What does the phrase "people try to empty their minds of thoughts" mean?
A. People rid their minds of things that tend to distract them.
B. People throw out old ideas and perspectives to start fresh.
C. People feel like their thoughts no longer need attention.
D. People stop thinking about difficulties and focus on dreams.