Answer the following question given this paragraph: 

Larger amounts of sulfur also come from hydrogen sulfide recovered during the purification of natural gas. Sulfur exists in several allotropic forms. The stable form at room temperature contains eight-membered rings, and so the true formula is S8. However, chemists commonly use S to simplify the coefficients in chemical equations; we will follow this practice in this book.


Q: What does the stable form of sulfur at room temperature contain?

 Choices:

- six - membered rings

- four - membered rings

- electron shell

- eight-membered rings

A:
eight-membered rings
