Based on geographical analysis and the article, the idea from the Barrier Islands of Georgia's Coastal Plain about the setting and its development of the plot of The Last Wave is "The Barrier Islands are the last landmass before the open water of the Atlantic Ocean."
Barrier Islands of Georgia's Coastal Plain are categorized into 13 islands. These islands include the following:
Barrier Islands of Georgia's Coastal Plain is famous for being the buffer or defense against ocean and storm forces for the mainland.
Hence, in this case, it is concluded that the correct answer is option C. "The Barrier Islands are the last landmass before the open water of the Atlantic Ocean."
Learn more about the Barrier Islands of Georgia's Coastal Plain here: https://brainly.com/question/25860805