Final answer:
As Japan's profits grew, so did its population, supporting the idea about the relationship between the size of the country and the type of goods it exports.
Step-by-step explanation:
The detail that supports an idea about the relationship between the size of the country and the type of goods it exports is: As Japan's profits grew, so did its population. This detail suggests that as Japan's economy expanded, it was able to invest in industries and technologies that allowed it to produce and export a wider range of goods. With a larger population, Japan had more labor resources available to support its growing industries.