Answer Choice C invalid through "some"

Please Help me Understand C:1 SE --MOST-- 18+ HRS ---> NOT TLA SE --- SOME-- NOT TLA NOT TLA --- SOME ---- SE C:2 SE --- SOME --- NOT TLA ---->NOT HE SS --- SOME-- NOT HE NOT HE -- SOME--- SE ANSWER CHOICE C: VIOLATE THIS CONCLUSION BY STATING HE --- SOME --- SE NOT SURE WHY IT WOULD NOT BE THE CORRECT ANSWER CHOICE SINCE IT CONTRADICTS THE CONCLUSION. I UNDERSTAND THE D IS ARRIVED AT BY CONCLDING: HE --- SOME--- TLA --> NOT 18 + HRS. HE --- SOME --- NOT 18 + HRS DOES THIS ALWAYS HAVE TO BE THE CASE??