Answer:
Letter e is correct. This practice prevents a passenger who purchased a discounted fare from reselling that ticket to another customer who is willing to pay more.
Step-by-step explanation:
Price discrimination is a practice where selling the same product can have different values.
This practice is very common in airlines, whose activities have variables that directly influence ticket pricing. As well as they can offer promotional prices, and advantages and benefits, which contributes to fluctuating prices of the same air ticket for different types of customers.
Therefore a legal photo ID is required with the ticket for greater control and ease of price discrimination, as well as to avoid arbitrary ticket transfer.