At what temperature does the silica sand start expanding thermally?

• A. 918¬¨¬®‚Äö√†√ªF
• B. 843¬¨¬®‚Äö√†√ªF
• C. 1063¬¨¬®‚Äö√†√ªF
• D. 1124¬¨¬®‚Äö√†√ªF