Given the Following Sorites: Some G Are A

Multiple Choice

Given the following sorites: Some G are A.
No G are K.
All N are K.
All F are N.

No F are A.
This sorites is:

A) Invalid because one of the middle terms is undistributed.
B) Invalid because a term is distributed in the conclusion but not in the premise.
C) Invalid because the conclusion in negative but three premises are affirmative.
D) Valid because no rules are broken.
E) Valid because a negative premise requires a negative conclusion.