(D) . $F$-centres (from the German word $\text{Farbe}$ meaning colour) are the sites where anions are missing from the lattice and electrons are trapp

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(D) . $F$-centres (from the German word $\text{Farbe}$ meaning colour) are the sites where anions are missing from the lattice and electrons are trapped in the resulting vacancy to maintain electrical neutrality. These trapped electrons are responsible for the colour of the crystal.