Answer:e. external opportunity
Step-by-step explanation:
External opportunities refers to advantages available to a firm as a result of the environment or industry at which it operates for example goverments grants for industry, pioneer industry etc
In the above scenario the cruise transport is been patronize as a result of people loosing confidence on the security of the air transport, this is coming to the cruise transport not because of their internal qualities or efforts but due to the environmental advantages.
It's not an internal strength, weakness or threat since it's not due to their internal qualities or demerits and it's not an external weakness because it's bringing in an advantage to the firm's but it's rather an external opportunity.