The most suitable title for the passage would be ______.

A．The study and the use of "Ideal Weights' tables began in the same period.
B．More deaths have occurred in recent two-year periods than before.
C．The study was designed to make worthless the "Ideal Weights' table.
D．The same number of men and women in the study have die

A．are in a majority
B．have weight to height ratios below the national average
C．have the best life expectancy
D．the shortest life expectancy