Example of a three-dimensional silicate is: zeolites, feldspars, beryls, ultramarines

When all the four corners of a tetrahedron are shared with other tetrahedral, the three-dimensional network structure is obtained. Since all the oxygen atoms are shared, these silicates are neutral. Zeolites and feldspars (Eg: albite(NaAlSi3O8)) are three-dimensional networks of aluminosilicates. Ultramarines is Na8[SiAlO4]6(S3)2 is also a 3 dimensional silicate. Hence, options A, B, and C are correct.