Final answer:
Paula, being an expert on the history of rock music compared to novice Donald, is more effective at determining correct solutions concerning rock music.
Step-by-step explanation:
The question is asking for a comparison between Paula and Donald's abilities concerning rock music based on their level of expertise. Since Paula is described as an expert on the history of rock music while Donald is a novice, it can be inferred that Paula has a deeper understanding and knowledge in this field. Therefore, the correct answer to the question would be:
d. is more effective at determining correct solutions concerning rock music
This answer choice suggests that Paula's expertise enables her to effectively find correct answers about rock music, likely because of her extensive knowledge and experience in the subject.