Final answer:
Luis likely wants to go to the playground to avoid playing Cryptic Realms, as implied by his relief and the absence of any intention to bring the game outside.
Therefore, option C is correct.
Step-by-step explanation:
Based on the context provided by the ninth, tenth, and eleventh paragraphs, Luis's reason for wanting to go to the playground is not explicitly stated. However, given the information from the provided text, one could infer that Luis wants to go to the playground to avoid playing Cryptic Realms, which is indicated by his relieved expression and the mention that Byron should put his toy away before they go outside. The suggestion by Luis that he could push Byron on the swings, and the absence of any mention of bringing the game to the playground, also support this inference.