Final answer:
Without specific context from the text or source material, it is not possible to accurately determine the type of trading cards Randy and Eli made up. The options suggest different themes, but the correct answer requires further information.
Step-by-step explanation:
The question is asking about a specific type of trading cards that characters named Randy and Eli created. To provide an accurate answer, one would need additional context from the text or story that these characters are part of, as the creation of trading cards could be a detail from a novel, a short story, or another form of narrative.
However, without the context from the specific text or source material, it is not possible to determine with certainty which type of trading cards Randy and Eli made up. The options given: A) Baseball cards B) Superhero cards C) Dinosaur cards D) Alien cards, suggest different themes for the cards, but without further information, an accurate answer can't be given.
In a broader sense, when creating trading cards, the design and theme are often based on popular interests or genres such as sports, comics super heroes, prehistoric creatures, or extraterrestrial beings, among others. These cards can be collected, traded, and used in games, depending on their intended purpose.