Answer:
The most compelling benefits that is unique to social networking sites like LinkedIn from a sales representative's perspective is:
C. Sales reps can engage with decision makers in a non-selling environment to develop relationships and trust.
Step-by-step explanation:
Such relationships can be carried forward to reach business deals that could not have been possible otherwise. This is because social networking sites likes LinkedIn provide platforms for some informal interactions. If a sales representative engages a decision maker in a non-selling environment, they can usually develop lasting trust and relationships that will ease business transactions. The social network platform has provided the two individuals the opportunity to meet before the business deals, thereby smoothening their relationships.