Chemistry question about glass?

Fused silicate glasses consist primarily of __________.

a. K2SiO3 and Ag2SiO3

b. K2SiO3 and MgSiO3

c. Na2SiO3 and K2SiO3

d. CaSiO3 and MgSiO3

e. Na2SiO3 and CaSiO3