Read four paragraph summaries from a draft about a repaired wetland boardwalk. Paragraph A: Engineers and ecologists inspected the damaged supports and redesigned several sections so water could move beneath the path without concentrating around a few posts. Paragraph B: The passage opens by explaining that repeated flooding had shifted parts of the old boardwalk and forced the wetland trail to close. Paragraph C: After reopening, staff photograph the supports after major storms and close short sections when water levels make access unsafe. Paragraph D: The writer concludes that the repair is not a promise that flooding will stop; it is an effort to improve access while respecting a landscape that is expected to change. Which order gives the passage the clearest flow?