Which of the following is essential for assessing the success of a health education program?

Measuring student attitudes is essential for assessing the success of a health education program because attitudes significantly influence behavior and learning outcomes. Understanding how students feel about health-related topics or the program itself can provide insight into their engagement and willingness to adopt healthy behaviors. Positive attitudes towards health education can indicate that students are more likely to utilize the knowledge and skills gained, which is a critical measure of the program's effectiveness.

In contrast, evaluating student grades focuses solely on academic performance and may not capture the overall impact or effectiveness of the health education program. Feedback from parents can be informative, but it may not directly reflect the students' perspectives and experiences. Program duration is a factor in implementation but does not inherently assess the program's success or the students' learning outcomes and engagement with the content. Therefore, measuring student attitudes provides a more comprehensive assessment of how well the program achieves its goals and influences students' health behaviors.