It's hard to appreciate what is essentially slime, but we have mucus for some very good reasons. It helps to keep us healthy and lets us know when our bodies are under attack. We would be wise to respect what our bodies do to keep us safe. So the next time you find yourself reaching for a tissue, remember mucus is your friend and ally.

Which of the following sentences from the bolded introduction serves as the hook for this essay?

In fact, it's high time mucus got a lot more respect.
It is perhaps the most annoying part of having a cold or allergies.
Just the name itself will make you giggle.
Mucus, however, plays a very important role in defense of our bodies and our health.