In a certain code language, 'bart il arn' means 'thrills and frills', 'hed mik ain' means 'diamonds are forever', 'ad ket hed' means 'hard as diamonds', 'lim arn kelt' means 'rock music thrills', 'ket kelt lim' means 'hard rock music'. Which is the code for the word 'diamonds' in that code language?

• A. hed
• B. mik
• C. ain
• D. hed or ain