Economists Might Disagree on a Question of Policy Because

Economists might disagree on a question of policy because:
(i) They have made different assumptions
(ii) They have different normative views on policies
(iii) They disagree about the role economics should play in society

A) (i)
B) (ii)
C) (i) and (ii)
D) (i) , (ii) and (iii)