Given the Following Sorites: Some M Are R

Given the following sorites: Some M are R.
All R are H.
All H are D.
No K are D.
Some K are not M.
This sorites is:

A) Invalid because a term is distributed in the conclusion but not in the premise.
B) Invalid because a universal premise requires a universal conclusion.
C) Invalid because a term is distributed in a premise but not in the conclusion.
D) Valid because a particular premise requires a particular conclusion.
E) Valid because no rules are broken.