In 1965, about 44% of the U.S. adult population had never smoked cigarettes. A national health survey of 1472 U.S. adults (presumably selected randomly) during 2010 revealed that 677 had never smoked cigarettes. A 99% confidence interval for the proportion of U.S. adults in 2006 who have never smoked is:
A) 0.461 to 0.56.
B) 0.426 to 0.493.
C) 0.481 to 0.54.
D) 0.487 to 0.534.