Query about question "The statue unveiled to commemorate..." [1335]

https://www.gregmat.com/problems/verbal?problem=the-statue-unveiled-to-commemorate


Here’s how I solved:

Anything but = Everything except

Ironic = Surprising

The author states / line states in a simplified manner- The statue was everything except _____, which is ironic because he lived a flamboyant lifestyle.

According to this reasoning and understanding, the blank should be filled with a synonym of flamboyant.

humdrum - contrasting, so out

futuristic - no evidence, so out

arresting - keep, not sure about meaning

impetuous - keep, a flamboyant person can be impetuous

redundant - contrasting, so out

How do i select between option C & D? Is my process and understanding correct?

Yes.

If someone is impetuous, are they likely to be flamboyant?

If someone is flamboyant, are they likely to be impetuous or make random decisions?