单选题 The biggest problem with the U. S. health - care system is that it has long been designed to respond to illness rather than prevent it. According to an analysis by the Common wealth Fund, a foundation that funds health - care research, half of American adults in 2005 did not receive recommended preventive care, which includes vaccinations, cancer screenings and blood -pressure checks. When we do get our cardiac health checked, too often it's because we've been rushed to the emergency room suffering from chest pains. When we do get a cancer evaluation, too often it's a diagnosis of advanced disease that has spread beyond the initial tumor site.
What will probably happen under the present US health -care system?

• A. All Americans do not receive preventive care.
• B. Many Americans seek medical help when it is too late.
• C. Everyone who is sick will receive medical help.
• D. Americans do not receive medial help even when they are sick.