(B) $SiO_2$ (silica) is a covalent network solid where each $Si$ atom is $sp^3$ hybridized and bonded to four oxygen atoms in a tetrahedral geometry.

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(B) $SiO_2$ (silica) is a covalent network solid where each $Si$ atom is $sp^3$ hybridized and bonded to four oxygen atoms in a tetrahedral geometry. Due to the presence of $Si-O$ bonds and the nature of the oxide,$SiO_2$ is acidic in nature,as it reacts with strong bases to form silicates.