At 25°C CO₂ Is a Gas and SiO₂ Is a High-Melting

Multiple Choice

At 25°C CO₂ is a gas and SiO₂ is a high-melting solid.In these compounds of oxygen

A) both carbon in CO₂ and silicon in SiO₂ are π-bonded to two oxygen atoms.
B) both carbon in CO₂ and silicon in SiO₂ are σ-bonded to four oxygen atoms.
C) carbon in CO₂ is π-bonded to two oxygen atoms and silicon in SiO₂ is σ-bonded to four oxygen atoms.
D) silicon in SiO₂ is π-bonded to two oxygen atoms and carbon in CO₂ is σ-bonded to four oxygen atoms.