Final answer:
Synergy between companies is demonstrated when parties collaborate for mutual benefit, such as the NBA and its athletes co-promoting sponsors, thereby magnifying marketing potential. Hence, the correct answer is option b.
Step-by-step explanation:
An example of synergy between companies is: The NBA advertising for their official sponsors and individual athletes within the league advertising their own sponsorship such as Nike in order to increase marketing potential for all.
This represents a synergistic relationship because both the NBA and the individual athletes are working together to create a more significant overall marketing impact, benefiting from the increased exposure and association with each other. This synergy can lead to increased brand awareness and sales for all parties involved.