Which of the Following Are We Likely Going to Want

Multiple Choice

Which of the following are we likely going to want to explain with an economic model?
i. Why people in the United States are fifty times richer than Ethiopians.
ii. What causes economic growth.
iii. What we think politicians should do with taxes.

A) i only
B) ii only
C) iii only
D) i and ii
E) All of these options are correct.