Final answer:
The level of intrinsic motivation is the best predictor of a student's future academic success, as it reflects their perseverance and dedication, which are more indicative of success than IQ or socioeconomic status.
Step-by-step explanation:
The best predictor of Susan's overall success in high school next year, without any additional information, would be c) Her level of intrinsic motivation. Research has consistently shown that grit and perseverance are critical factors that influence academic achievement, even more so than IQ or talent. While socioeconomic status can also be a significant factor, the personal drive represented by intrinsic motivation is directly related to the effort and persistence applied to overcome challenges and achieve goals.
It's important to note that while IQ can indicate cognitive potential, it doesn't account for work ethic or the ability to persevere through difficulties. Similarly, socioeconomic status provides context but not a definitive prediction of individual performance. Intrinsic motivation, on the other hand, reflects a student's passion and dedication to their studies, which is crucial for consistent engagement and long-term success. Therefore, while multiple factors can play a role, a student's internal drive is essential for succeeding in the face of academic challenges.