Even though it takes a long time for your eyelashes to grow, it is important that they do! Your eyelashes keep dirt and dust out of your eyes. They also act as a warning system. When your eyelashes sense that something is getting too close to your eyes, they trigger the blinking reflex. This causes your eyelids to close, protecting your eyes from danger.
A. “Even though it takes a long time for your eyelashes to grow, it is important that they do!”
B. “Your eyelashes keep dirt and dust out of your eyes.”
C. "They also act as a warning system.”
D. “When your eyelashes sense that something is getting too close to your eyes, they trigger the blinking reflex.”
Which of the following sentences from paragraph 7 best describes that paragraph's main idea?