How many lives could probably be saved each year in the United States by eating fish according to the Dutch study

A．The Dutch research has proved that eating fish can help to prevent heart disease.
B．Heart doctors won't call your house so long as you keep eating fish each day.
C．Among all the diseases heart disease is the most dangerous in America.
D．There is a low incidence of heart disease in such countries as Japan and Greenland.

A．Because American people drink too much spirits.
B．Because there are a great number of fat people there.
C．The author doesn't give a definite answer.
D．Because American people eat too much fatty fish.