The correct option is
D Rampant corruption
In Greek mythology, 'Augean stables' refers to the extremely dirty stables that were finally cleaned by Hercules who diverted two rivers through them. In standard English, the phrase 'Augean stable' most often appears in the phrase 'clean the Augean stable', which usually means clear away corruption. Therefore, 'Augean stable' refers to rampant corruption. Option C is the correct answer.
Options A, B, D and E are incorrect because these are not in accordance with the explanation given above.