Final answer:
Option D (None of the above) is the correct choice because there isn't enough information provided about Brand X's price setting in Scenario I to confirm any of the other statements regarding market capture or retention.
Step-by-step explanation:
Without specific data from the scenario described regarding Brand X and its market share under Scenario I, none of the options A, B, or C can be confirmed as true based on a demand-based pricing analysis. Options A and C require information about market share percentages that is not provided. Option B focuses on the retention rate of Brand X's free version which also cannot be confirmed without additional details. Hence, Option D: None of the above is the correct answer because we lack the necessary information to make an informed decision about the other statements provided.