What is one purpose of the prologue in Sugar Changed the World?

to illustrate that living in the Caribbean was not profitable, but affected the history of sugar
to persuade readers that, before the 20th century, most people’s fortunes depended on sugar
to emphasize how sugar plantations depended on involuntary servitude, and how they shaped the world economy
to inform readers of the authors’ family histories and how their connection to sugar spurred their interest and