The dielectric constant (relative permittivity) of glass is given by

The correct answer is: C. 2.0 to 4.0

The dielectric constant (relative permittivity) of a material is a measure of how much it concentrates electric field lines. It is a dimensionless number that is always greater than or equal to 1. The dielectric constant of glass is typically in the range of 2.0 to 4.0.

Option A is incorrect because the dielectric constant of glass is typically greater than 0.1.

Option B is incorrect because the dielectric constant of glass is typically less than 1.

Option D is incorrect because the dielectric constant of glass is typically less than 100.