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What makes up the primary composition of glass?

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What makes up the primary composition of glass?

(a) MgO

(b) K2O

(c) SiO2

(d) BaO

I have been asked this question in an interview for internship.

Asked question is from Insulating Materials in chapter Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct answer is (c) SiO2

For explanation I would say: Glass is primarily composed of SiO2 with over 70% in bulb and bottle glass, and over 80% in Pyrex. K2O  Is generally found having a composition of less than or around 1%. MgO and BaO aren’t found in Pyrex but are available in bottle and bulb glass having less than 4%.

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