Answer:
Mucus also has some antibodies that increase our ability to fight off bacteria and viruses.
Step-by-step explanation:
The idea that mucus is seen as a gross thing is what everyone thinks. But what we don't know or neglect to understand is that it is an essential necessity for the well-being of our bodies.
The line "Mucus also has some antibodies that increase our ability to fight off bacteria and viruses" supports the idea that it helps the human body. By the very fact that it "increases" our immunity is strong evidence that it is helpful to the body.
Thus, the correct answer is the last or fourth option.