Passage Summary: A park wants local trees that don't get too huge. A group donated trees from a nursery that mostly sells local plants, so the author thinks the trees will fit the park's rules.

Conclusion: The donated trees likely comply with the master plan's requirements.

Reasoning: The trees were bought from a nursery that primarily sells native plants, and the master plan allows for native species that do not grow to an excessive size.

Analysis: This argument has two significant gaps: 'mostly native' is not 'entirely native,' and we have no information about the size of the donated trees. To strengthen the conclusion, we need to increase the likelihood that these specific trees are both native and small. Look for an answer choice that addresses one of these uncertainties, perhaps by suggesting the nursery's non-native stock is rare or that they don't carry large species like cottonwoods. We want to move the needle from 'maybe' to 'probably' by shoring up the evidence.