Final answer:
The riddle related to characters associated with Arkham Asylum in the Batman series, suggesting a scenario with creatures or characters moving in and out. However, without explicit clues pointing to any of the given options, a confident solution to the riddle is not possible.
Step-by-step explanation:
The question you've asked is a riddle, which is a type of word puzzle typically found in the context of English learning. By analyzing the riddle's details, it becomes apparent that this is a playful scenario involving a quantity of legs and their actions. The key to solving the riddle is not to focus on a literal interpretation but to figure out the suggested circumstance. In this case, it seems to hint at creatures or characters entering and leaving a location or a scene of a story.
The options you've provided all relate to characters typically found in the Batman series, all of whom have been known to inhabit or visit Arkham Asylum. This location is notorious in the Batman lore as a fictional psychiatric hospital that houses many of his adversaries. However, without explicit details connecting the riddle to one of these characters or the place itself, the riddle seems unsolvable.
Given that there are no clues pointing to a specific character, we cannot confidently choose one of the options (a) The Riddler in Arkham Asylum, (b) The Joker in Arkham Asylum, (c) Two-Face in Arkham Asylum, or (d) The Penguin in Arkham Asylum as the correct answer. Therefore, without additional context or information provided in the riddle, we are unable to determine the solution based on the given choices.