What type of feedback does TC 3-22.9 suggest for effective training evaluations?

The correct choice emphasizes the importance of curated feedback from trainers and peers through structured mechanisms. This approach aligns with best practices in training evaluations, as it allows for a comprehensive assessment of a trainee's performance. Curated feedback helps identify both strengths and areas for improvement, fostering an environment conducive to learning and development.

Making use of input from multiple perspectives ensures that the feedback is well-rounded and takes into account different aspects of performance that might not be evident from quantitative measures alone. This type of feedback is essential for honing skills, reinforcing lessons learned, and guiding future training endeavors to enhance overall effectiveness.

In contrast, while baseline assessments and performance feedback from outside observers can be valuable, they may not provide the ongoing support and tailored insights that curated feedback offers. Relying solely on quantitative results from tests doesn't capture the entirety of a trainee’s progress and does not provide the qualitative insights that pave the way for improvement and skill mastery. Therefore, curated feedback plays a crucial role in effective training evaluations as outlined by TC 3-22.9.