Marietta is a store manager and notices that on rainy days, customers who have a wet umbrella feel inconvenienced deciding what do with it. Marietta decides to place a dispenser near the store entrance with complimentary plastic bags for covering an umbrella. Which aspect of competitive advantage is Marietta concerned with?

Bette customer service

Explanation:

Remember, competitive advantage focuses even on a single unique characteristics or action that a business does that separates it from its competitors.

In this case it the was the act of making their customers feel convenient even with a wet umbrella. This quality of better customer service is indeed a competitive advantage, if others in the same business do not provide such.