C). It describes how testimony on the brutal practices on sugar plantations convinced Parliament to end the slave trade.
Explanation:
As per the question, in the given passage from "Sugar Changed the World", the author's central claim is to display that how 'sugar trade led to the end of slavery' which he substantiates by proposing the evidence that states 'how acute brutality of sugar plantations persuaded the parliament to change its viewpoint and mark an end to the ongoing brutal enslavement/slave trade'.
This claim is reflected through the phrase "in the age of sugar, slavery...extreme brutal' that compelled the parliament to review its norms of slavery and mark its ending. Therefore, the author states 'sugar.....link between slavery and freedom'. Thus, <u>option C</u> is the correct answer.
