单选题 Nevertheless, hand - washing is still your best defense against getting sick generally this fall - colds and other respiratory diseases are no fun, even if they don't sound as scary as swine flu. For that and other flu viruses, don't seek solutions at the sink: your best chance of avoiding H1N1 this fall is to get the vaccine once it becomes available.
"At the sink" in the paragraph refers to the effort to avoid being infected by flu viruses

• A. before the disease becomes too serious.
• B. by hand - washing.
• C. by getting the vaccine.
• D. before you are surrounded by carriers.