Question

select the best evidence to support the statement that crying can protect your eyes.
dust and dirt can make your eyes itchy and damage the delicate surfaces.
eyelashes act as filters, keeping many particles away from the surface of the eyes.
tears wash over the eyes to clean them. tears also contain an enzyme, called
lysozyme, that destroys bacteria.
saliva in your mouth washes over your teeth to clean them. it also prevents
microbes from growing inside your mouth.
your stomach can usually deal effectively with any microbes that enter it. the
digestive juices inside your stomach are extremely acidic, and will kill most
microbes. if toxins enter the stomach, you may vomit to expel them from your
body. toxins and microbes that get past your stomach defenses travel on through
your digestive system.
from carol ballard, the immune system. copyright 2003, 2009 by heinemann library

Explanation:

The statement is about crying protecting eyes. The text mentions "Tears wash over the eyes to clean them. Tears also contain an enzyme, called lysozyme, that destroys bacteria." This directly relates to how crying (tears) protects eyes by cleaning and having a bacteria - destroying enzyme. The other parts about saliva, stomach are not related to eyes.

Answer:

Tears wash over the eyes to clean them. Tears also contain an enzyme, called lysozyme, that destroys bacteria.