Drop down knowledge check with submit state change


I have been struggling for the last hour so I decided to try my luck here :-)

I have a knowledge check with 3 drop downs. I have a "disabled state" submit button in white. I have a trigger that say "Change state of submit button to Normal (color change) wen the state of all the text boxes (3 drop downs) are visited. I tried selected and other combinations but the submit button doesn't change state.  Any ideas?


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