Answer:
D. An export of U.S. services.
Step-by-step explanation:
Since the avengers movie generated the subsidiary of Disney Studios that sold the 7 billion yuan worth tickets in china at the time of first month
so here the national income and the accounts related to the product shows the export of the united states services as the services are provided from one country to another due to this they sold 7 billion yuan tickets
Therefore the option d is correct