can someone tell me what type of flaw this question is presenting? thanks Ya'll

@J.Y.Ping I overlooked the word "must"In John's statement and paid attention to "at least" and made that the sufficient condition instead. Totally wrong there, made choose answer C.

@ArdenAmarelo thanks! I will def try that!

@ArdenAmarelo

Any tips for contrapositives on MBT questions? I think, if i understand this portion, I can do really well on the lsat.