Macao was a
a. trade route.
c. british explorer.
b. port city.
d. chinese delicacy

Macao is a city (in an autonomous region in China today) - so it can't be an explorer or a route or a delicacy - so just knowing that Macao is a city is enough to know that  answer b) is the correct one.

It was a port city where the foreigners could trade with the Chinese.

2cool and cold temperature unless its an ever green tree 

None   they are   equally likely to occur on any plate boundary