Which of these activities will most likely result in an external benefit?

Question

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Planting a flower garden on a vacant lot next to one's house can have a positive impact on the surrounding environment by improving air quality, providing habitat for pollinators, and adding aesthetic value to the neighborhood. These benefits are external to the individual and accrue to the community as a whole. The other activities listed do not generate significant external benefits.

Which of These Activities Will Most Likely Result in an External