If We Assume the Traditional View of Existential Import, Why

Multiple Choice

If we assume the traditional view of existential import, why is the following syllogism invalid? All millionaires are well-paid people.
All well-paid people are good at their jobs.
Some people who are good at their jobs are not millionaires.

A) undistributed middle
B) illicit major term
C) illicit minor term
D) two negative premises
E) negative premise with affirmative conclusion, or negative conclusion with no negative premise