Which of the Following Represents Current Knowledge of the Role

Which of the following represents current knowledge of the role of vitamin and mineral supplements in physical performance?

A) When taken right before an event,they have been shown to benefit performance
B) Moderate amounts have been shown to improve the performance of most elite athletes
C) They may be beneficial for athletes who struggle to meet their energy requirements
D) Except perhaps for iron,they are needed in high amounts to meet the needs of athletes exposed to hot and humid weather conditions