The people who migrated to melanesia developed
a. an advanced economy based on telecommunications and information technology.
b. protected settlements.
c. a culture based on art.
d. an economy based on trade.

The correct answer is letter D. an economy based on trade. The people who migrated to Melanesia developed an economy based on trade. Before the time of currency was used, people back then do trading with their property they own if they want to have something. It's like the same as the barter system or the barter economy.

There is no map, maybe give the link, it may be b

Summer months are the wettest.