The correct answer is option 4, Tortoise. A tortoise has the longest lifespan among the presented animals. While elephants can live for a long time, their average life span is generally between 60-70 years. Crocodiles can live for an extended period as well, with an average lifespan of around 70-100 years. Dogs, depending on their breed, have an average life span ranging from 8-15 years. In contrast, tortoises have an impressive lifespan and can live for over 150 years. It is important to note that the actual lifespan of an animal can vary depending on several factors like species, environment, diet, and genetics. Therefore, while tortoises typically have the longest life span among the given options, it is essential to consider other factors that can affect an animal`s lifespan.