If We Assume the Modern View of Existential Import, Why

Multiple Choice

If we assume the modern view of existential import, why is the following syllogism invalid? No one who has sung for the Metropolitan Opera has been in Kuala Lumpur.
No chiropractor has sung for the Metropolitan Opera.
No chiropractor has been in Kuala Lumpur.

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