Passage Summary: A banana disease is everywhere, but we can kill it with chemicals. These chemicals are dangerous near people, so they can't be used in small, crowded farms, but they're fine for big, remote plantations. Since most big plantations are remote, the author thinks the global banana supply is safe.

Conclusion: The majority of the global banana supply is not in significant danger from Sigatoka disease.

Reasoning: While Sigatoka is widespread, it can be managed with fungicides that are safe for use on large, isolated plantations, even though they are unsafe for small groves in populated areas.

Analysis: The author makes a jump from the safety of large plantations to the safety of the 'world's banana crop.' To bridge this gap, the argument must assume that these large, isolated plantations actually produce the bulk of the world's bananas. If small, populated groves were responsible for most of the production, the disease would still be a massive threat to the global supply. Look for an answer that confirms the large plantations account for most of the crop.