Passage excerpt: [1] The volunteers arrived at the community garden just after sunrise. [2] They measured each raised bed and marked the rows with twine. [3] By noon, the coordinator was explaining how the new compost bins would work. [4] She showed volunteers which scraps could become soil for the next planting season. The writer wants the excerpt divided only where the focus truly changes. For the strongest unity and cohesion, where should a new paragraph begin?