Passage Summary: Big plant nurseries typically guarantee that the raspberry plants they sell to professional farmers are healthy. However, a man named Johnson bought raspberry plants from Wally's that turned out to be infected with a virus.

Reasoning: Most large nurseries sell disease-free plants to commercial growers, yet a specific shipment from Wally's Plants to Johnson contained a common virus.

Analysis: In a 'Most Strongly Supported' task, we must treat the premises as absolute truth and see what naturally follows without overreaching. We don't actually know if Wally's is a 'large nursery' or if Johnson is a 'commercial grower,' so be careful with those labels. It’s a classic LSAT setup where the 'exception' (the infected plants) might imply that Wally's doesn't fit the 'most' category, or that Johnson's situation is an outlier. Look for an answer that stays within the bounds of these specific facts.