Final answer:
While international trade in both goods and services has increased significantly, specific data would be required to confirm the exact figures mentioned in the claims. However, it is evident that the growth in exports of services is notable, and the role of the U.S. in world exports of commercial services has evolved.
Step-by-step explanation:
In examining the volume of international trade, we can observe several trends over the years. Based on historical data and current economic trends, we would need to investigate each claim individually to ascertain their accuracy. Let's consider the given options:
- A. Exports of merchandise have indeed grown significantly, but the specific figures would need to be confirmed with trade data for the relevant years.
- B. Exports of services have experienced substantial growth, and supporting data indicates that the importance of services has expanded, with U.S. exports of services rising from about one-fifth of U.S. exports of goods in 1980 to about one-half in recent years.
- C. Regarding the proportion of world exports of commercial services by the United States, data would need to be reviewed to verify the precise change in percentage.
While we can assert that international trade, both in goods and services, has grown substantially and has undergone significant transformations, without specific trade figures for each claim, it is prudent to choose option 'E', which suggests that two of the statements A, B, and C are true, with the understanding that further data is necessary to verify these claims accurately.