Answer:D( competition)
Explanation:
Competition can not really determine the availability of prices by offering deals to specific buyer because his competitor might not be more than his company price.
As per the text, the Norwegian cruise lines control the availability of the process by offering the deals that are made for the specific groups.
Hence the option D is correct.
Learn more about the controls the availability of prices by offering.
brainly.com/question/24628649.