The correct option is D Epithelial cells have spaces between them.
The whole body surface is covered by the epithelial tissue which comprise of closely packed cells arranged in one or even more layers. The main responsibility of this tissue is to cover the whole body surface-externally and internally. The tissue which is present on the surface of interior body is called as endothelium. The epithelial tissue is so tightly packed that it does not have any intercellular space in between. The intercellular substance is too present in very small amount.