The OA is debatable. The unsettling mannerism is the characteristic of the grifter as per the original but choice E says that it is the characteristic of both the grifter and clown. Clowns are more of jesters with pranks rather than confidence tricksters. I think it is more sensible to think the original text way rather than as in E. Of course, the tense form is better in E with the use the present perfect to tally with its marker ' ever since'.
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