The correct answer is Brazil.
Brazil is the world’s largest producer of sugarcane and sugar. In 2020, Brazil produced 74.2 million metric tons of sugar, accounting for 23% of global production. India was the second largest producer, with 35.7 million metric tons, followed by China with 11.2 million metric tons.
Cuba is not a major producer of sugar. In 2020, Cuba produced 1.3 million metric tons of sugar, accounting for less than 1% of global production.
Australia is a major producer of sugar, but it is not as large a producer as Brazil or India. In 2020, Australia produced 5.3 million metric tons of sugar, accounting for 1% of global production.
Therefore, the correct answer is Brazil.