【单选题】Which of the following statements is correct about the extent of disagreement among economists?
A.
There is a great deal of agreement among economists on virtually every economic issue.
B.
There is a great deal of agreement among economists on many important economic issues.
C.
All disagreements among economists are attributable to differences in their values.
D.
All disagreements among economists are attributable to the fact that different economists have different degrees of faith in the validity of alternative economic theories.