Two Advisors to the President Have Given Their Policy Recommendations

Multiple Choice

Two advisors to the president have given their policy recommendations, and they are in disagreement.Why do these economists disagree?

A) because they do not have all relevant information about the problem 
B) because they disagree on the nature of some cause-effect relationship 
C) because they have different values and opinions 
D) All of the above are reasons for disagreements among economists.