Which of the following is an example of an arthropod?

An arthropod is characterized by having an exoskeleton, segmented body, and jointed appendages. Crabs belong to the class Crustacea, which is a subgroup of the arthropods, making them a prime example of this group. The presence of these features—such as the hard shell (exoskeleton) and jointed legs—qualifies crabs as arthropods.

Frogs, on the other hand, are amphibians and do not possess the characteristics of arthropods. Similarly, a tulip is a flowering plant and lacks any characteristics associated with the animal kingdom. Goldfish are vertebrates, specifically fish, and do not have the key attributes that define arthropods.

Thus, a crab is the only option that fits the definition of an arthropod, illustrating the distinct biological classification that defines this group.