The correlation coefficient between the returns on a broad index of U.S. stocks and the returns on indexes of the stocks of other industrialized countries is mostly _____, and the correlation...

The correlation coefficient between the returns on a broad index of U.S. stocks and the returns on indexes of the stocks of other industrialized countries is mostly _____, and the correlation coefficient between the returns on various diversified portfolios of U.S. stocks is mostly _____.
a. less than .8; greater than .8.
b. greater than .8; less than .8.
c. less than 0; greater than 0.
d. greater than 0; less than 0.