Answer:
Squamous epithelia.
Step-by-step explanation:
The cells of the squamous epithelial are wider than their height. These cells are found in the lining of esophagus, mouth and alveoli of the lungs.
These cells helps to pass the material by the process of diffusion. These are the thinnest tissue and also plays an important role of filtration.
Thus, the correct answer is option (A).