Consider the punctuation decision in this draft. (1) A short policy memo evaluates a flood-preparedness workshop. (2) The writer begins with a brief account of how the plan was developed. (3) The workshop begins with neighborhood evacuation routes; afterward; participants practice assembling a supply checklist. (4) The passage continues by describing feedback from users. The writer is revising sentence 3. Start a new sentence with the conjunctive adverb. Which choice best carries out the writer's instruction?