Answer:
D. Foreign imports were taxed
Explanation:
1. Tea production expanded
2. Fast-growing rice introduced
3. Canal system expanded
4. Fine porcelain developed
Given that the above information shows that these products and structures are made internally, which was as a result of more demands for them.
Thus, this implies that there is a halt or reduction in the importation of these goods, which led to the promotion of internal consumption. Things that could lead to a reduction in importations are many among which is taxing of foreign imports heavily by the home country.
Hence, the summary of this information is "Foreign imports were taxed."
