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 computer is made of clay.
All computers are electronic devices.
Some electronic devices are not made of clay.

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