Answer:
C) to protect all concerned with the trade industry thus ensuring its continuation
Step-by-step explanation:
OPTIONS:
A) to protect the borders of China from illegal entry of foreigners
B) to protect foreign traders from a citizenry who did not like any foreign influence on their country
C) to protect all concerned with the trade industry thus ensuring its continuation
D) to protect the citizenry from foreign traders who were known to be brutal and barbarous