Historically, trade in oceania often
a. increased migrations along the islands.
b. had no effect on the development of cultures.
c. meant that different island people did not meet another.
d. decreased migrations among the islands.

A. Increased migrations along the islands.

This is the most logical answer of the four

500 books can be produced by one man and a printing press within 5 months, while a copyist can only produce one in the same amount of time

i know social security wasn't one.

explanation:

hope my answer has you!