다음 문장이 들어갈 위치로 가장 적절한 것은? Such large numbers are necessary since blood reserves are perishable and constantly need to be replenished. New York City Blood Center has experienced a constant shortage in blood donation. ( A ) To meet the needs, approximately 2,000 people need to donate blood every day to maintain its supplies. ( B ) One pint of donated blood can save up to three lives. ( C ) And one out of every three people will need a life-saving transfusion at some point in their lifetimes. ( D ) Donate blood through the New York City Blood Center.