Final answer:
Empathy is a key element in establishing strong interpersonal relationships and is vital for clear and effective communication, which is pivotal for successful long-distance collaborations and community development.
Step-by-step explanation:
A key element in cementing interpersonal relationships is C) Empathy. Empathy allows individuals to understand and share the feelings of others, which is essential for establishing strong communication relationships. In the context of collaborations, especially long-distance ones, it is crucial to use clear communication free of specific terms or jargon. It is also important to adapt, reflect, and be willing to be wrong to build authentic relationships and engage in reflexive communication. This strengthens the foundation for open dialogue and the ability to manage and resolve conflicts, leading to the development of the community and the success of partnerships.