Which feature allows LinkedIn users to endorse each other's skills?

C. Skill Endorsements is the correct choice because this feature is specifically designed for LinkedIn users to acknowledge and validate each other's skills. When a user endorses a skill, it serves as a form of recognition that the user possesses that particular capability, enhancing their professional profile.

This function encourages networking and can improve a user's visibility on the platform. By receiving endorsements, professionals can establish credibility and support from their connections, which can be beneficial in job searches or professional advancement.

Other options, while associated with interactions on LinkedIn, do not specifically facilitate this unique recognition of skills among users. Recommendations pertain to more detailed testimonials rather than simple endorsements. Messages allow for direct communication but do not focus on skill validation. Posts enable sharing content or updates but do not involve mutual acknowledgment of skills. Therefore, Skill Endorsements is the distinctive feature that encourages this meaningful exchange among LinkedIn users.