Energy Bands in Solids question from MHT CET 2026 (16 Apr, Shift 2)

Answer: (c)

1. Insulators have a very large band gap ($E_g > 3\text{ eV}$), so almost no electrons reach the conduction band.
2. A very few electrons can still be excited, so conductivity is not exactly zero but extremely small.
3. So the answer is (c) extremely small.