Final answer:
Without full context, option D may support the idea of a pet rock as a fad, while option B could indicate pet rocks as low-maintenance ‘perfect pets.’
Step-by-step explanation:
When considering the clue from the text that best supports the answer for Part A, it is essential to understand the context of the question. Without the full details of Part A, we can rely on the provided options to infer likely scenarios. If Part A is asking about the nature of 'pet rocks' as a fad, then option D, “The pet rock remains an iconic example of a fad.”, directly supports the idea of a fad by implying that pet rocks were a trend that became widely popular and recognized in a certain period - a hallmark of a fad. If the context is about the simplicity and lack of maintenance required for pet rocks as compared to other pets, then option B, “Dahl joked that this would make them ‘perfect pets.’”, would be more appropriate as it emphasizes the ease of care. To accurately choose the best evidence, it's important to be aware of the question's focus in Part A.