The correct option is A Ticks
Scorpions are predatory arthropod animals of the order Scorpiones within the class Arachnida. Arachnida is a group of organisms having jointed appendages. These are invertebrate animals. Arachnida includes spiders, scorpions, ticks, mites and solifugae. The mites may have eight or six legs. They are commonly known as parasites.
Thus, the correct answer is option A.