The building block of silicate minerals is the?

Question

The building block of silicate minerals is the

a.trigonal-planar SiO3 unit.
b.octahedral SiO6 unit.
c.tetrahedral SiO4 unit.
d.bent SiO2 unit.
e.linear SiO unit.

Answer 1

I would think SiO4 for the building block, although the chemical formula for the silicate itself would not reflect this ratio of 1:4.

Look at all the pyramids in the link below.