The author mentions that sailors could be killed from a “long-awaited taste of fruit,” which supports the answer (They could be easily overwhelmed), that “They could be easily overwhelmed” by outside stimuli. It is therefore unlikely that “fresh food could cure them of the disease,” as the answer (Fresh food could cure them of the disease) states. Answer (They would be prone to genetic mutation) is incorrect because scurvy doesn’t itself cause genetic mutation, and answer (They were more likely to commit suicide) is not discussed in the passage.