Choose the statement that best describes why textiles should not be exposed to ultraviolet rays:

A. Ultraviolet rays fade the colors in the fabric.
B. Ultraviolet rays will ignite the threads.
C. Ultraviolet rays fade and weaken the fabric.
D. Ultraviolet rays will weaken the fabric.

C. Ultraviolet rays fade and weaken the fabric.

C. Ultraviolet rays fade and weaken the fabric.

The best statement that describes why textiles should not be exposed to ultraviolet (UV) rays is C. Ultraviolet rays fade and weaken the fabric.

Explanation:
UV rays from the Sun or artificial sources can have damaging effects on textiles. Here's an explanation for each option:

A. Ultraviolet rays fade the colors in the fabric.
UV rays have the ability to break down and weaken the dye molecules in fabric, causing the colors to fade over time. This is why prolonged exposure to sunlight can result in color fading.

B. Ultraviolet rays will ignite the threads.
While UV rays can cause heat, they do not have the capability to ignite threads or fabric on their own. Ignition requires a heat source or an open flame.

C. Ultraviolet rays fade and weaken the fabric.
This statement is accurate. Exposure to UV rays can break down the fibers of the fabric, causing it to weaken and making it more prone to tearing or becoming threadbare. Additionally, the UV rays can fade the colors of the fabric, resulting in a dull or washed-out appearance.

D. Ultraviolet rays will weaken the fabric.
This statement is partially correct. UV rays can indeed weaken the fabric by breaking down its fibers, which reduces its overall strength and durability. However, it is important to note that UV rays primarily weaken the fabric through the process of oxidation, rather than simply by physical force.

In summary, option C correctly explains that exposure to UV rays can both fade and weaken the fabric.