Final answer:
Benchmarking does not assure a sustainable competitive advantage because it offers a snapshot that can be quickly outdated as market conditions change and competitors also adapt and improve.
Step-by-step explanation:
When benchmarking the competition, one benefit that is not guaranteed is E. Giving a sustainable competitive advantage. Benchmarking can lead to identifying best practices, quantifying gaps in performance, and generating new ideas for improvement, but it does not ensure a long-term competitive edge due to the dynamic nature of the market where competitors can also adapt and improve. In addition, it facilitates communicating greater possibilities within your organization, fostering an environment for continuous improvement. However, as business conditions and technologies evolve, what gives a competitive advantage today may not be sustainable tomorrow.