Which of the statements about life expectancy in the u. s. is correct?
a. people in the u. s. live longer on average than people in almost every country in the world.
b. people in the u. s. live shorter lives on average than people in some countries that receive foreign aid from the u. s.
c. across each state in the u. s., people live about the same number of years.
d. the long life expectancy in the u. s. shows that the quality of life, healthcare, and nutrition is better when compared to the rest of the world.