The correct answer is c) simple squamous.
Simple squamous epithelium consists of a single layer of flat cells, which allows for efficient diffusion and filtration. This type of tissue is ideal for lining structures such as blood vessels (endothelium) and the heart (endocardium) because it minimizes the distance substances need to travel. Its thin structure provides a smooth surface, reducing friction for the movement of blood. In contrast, other types of epithelial tissue, like simple cuboidal or simple columnar, are more suited for absorption and secretion rather than facilitating the rapid exchange of materials.