Final Answer:
The glass protects the artwork from pollutants, debris, and insects. Thus, the correct answer is option b) glass.
Step-by-step explanation:
Artworks are susceptible to damage from various environmental factors, and using glass in framing provides a crucial protective layer. Glass acts as a barrier against pollutants, preventing dust and airborne particles from settling on the artwork's surface. It also shields the artwork from debris that may be present in the surrounding environment. Insects, which can cause irreparable harm, are kept at bay, ensuring the longevity of the artwork.
Furthermore, glass is an ideal choice because it allows viewers to enjoy the artwork without compromising its protection. The transparency of glass preserves the visual integrity of the piece, allowing details to be appreciated without exposing the artwork to potential harm. This balance of protection and visibility makes glass a preferred choice for safeguarding valuable and delicate artworks.
Thus, the correct answer is option b) glass.