Hello, after rereading the question, I see why B is right. But I'm having trouble seeing why the answer choice I chose (A) was wrong.
I picked A because when I applied the negation test to it: It will NOT eventually be possible to breed strains of bananas that are resistant to Sigatoka disease, it seemed that it would attack the conclusion that most of the world's banana crop is not seriously threatened by the Sigatoka disease.
If it's not possible to ever protect bananas from the disease, then wouldn't the conclusion fall apart?
And this is my understanding of why B is right:
B negated would say: Large plantations produce FEW(?) or NONE of the world's bananas.
If this were the case, would the world's banana crop seriously be threatened by the disease because the fungicides only turn out to be used on the minority of banana crops, while the small banana groves (the majority of banana crops) won't be using fungicides, which therefore makes the conclusion fall apart?
Thanks in advance