Today many people take an aspirin at their doctor's recommendation as preventive medicine. The maker of Bayer aspirin has added calcium to its aspirin. The calcium is also often recommended by doctors to help maintain bone density. There are many types of aspirin on the market, but only one brand that contains calcium. For Bayer, this calcium additive is an example of:
A. brand quality.
B. brand equity.
C. a competitive advantage.
D. brand power.
E. a market opportunity.
Answer: C