Final answer:
Ehlers-Danlos syndrome in cats is characterized by fragile and easily bruised skin, due to a deficiency in type-III collagen that weakens connective tissues.
Step-by-step explanation:
The characteristic of skin fragility in cats with Ehlers-Danlos syndrome is D) Fragile and easily bruised skin. Ehlers-Danlos syndrome is a genetic disorder associated with a deficiency in the collagen molecule, particularly type-III collagen. This deficiency can be due to mutations affecting collagen synthesis or a lack of necessary enzymes, leading to an overall weakening of connective tissues in the body. As a result, patients with Ehlers-Danlos syndrome exhibit skin that is highly elastic and fragile, prone to tearing and bruising with minor trauma.