The statement that is not true of the trade of sugar is:
The profits from the sale of sugar were used to purchase more sugar plantations.
While profits from sugar trade were indeed reinvested in various ways, the specific phrasing suggesting that profits were directly used to purchase more plantations might not accurately reflect the complexities of the economic activities involved at that time. The other statements reflect well-documented aspects of the sugar trade and its connections to the Atlantic slave trade and the production of rum.