Question

what type of membrane consists of extensive areas of areolar tissue bounded by an incomplete superficial layer of squamous or cuboidal cells?

Explanation:

Synovial membranes have areolar tissue and an incomplete superficial layer of squamous/cuboidal cells. Mucous has epithelial + connective, cutaneous is skin (stratified squamous), serous has simple squamous + areolar but different structure. So synovial matches.

Answer:

D. Synovial membrane