Fourth Option “A perfect taste made possible by the most brutal labor.” Thus, option "D" is correct.
The author's main purpose of this excerpt is about the difficulties, problems and labor involved with the production of sugar.
He also points out that sugar is sweeter than honey. Both these purposes are fulfilled in this quotation i.e. “A perfect taste made possible by the most brutal labor.” A perfect taste for sweeter taste of sugar, and the most brutal labor for difficulties and labor put in for the production of sugar.
Thus, option "D" is correct.
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