Final answer:
The statement is true as typically all guests in a stateroom must meet the eligibility criteria to qualify for a promotional rate in the travel and cruise industry.
Step-by-step explanation:
The statement 'To be eligible for promotional rate, all guests in a stateroom must be eligible' is generally true. This is a common policy in the travel and cruise industry, where promotional rates are offered based on certain conditions or eligibility criteria that must be met by all occupants of the stateroom. For example, if a promotional rate is offered to seniors, then all guests staying in that particular stateroom would need to meet the age requirement to qualify for the discount. This ensures that the travel company can maintain consistency and fairness in their pricing strategy.