The correct answer is A. Jointed legs
Explanation:
Arthropods are a type of animal mainly characterized by an exoskeleton or external skeleton and jointed appendages or legs, which means all arthropods have legs or similar structures that are divided into different sections known as podomeres. In the same way, the body of arthropods is composed of different segments. This category includes animals such as spiders, scorpions, bees, crabs, among others. Additionally, some but not all arthropods have other features such as shell or wings. According to this, the characteristic that is shared by all arthropods is jointed legs (option A).
