alr this'll take a bit-
prepare:
note you may want to change the CSS style on button when selected
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first you'll have 2 buttons (note this still allows for as many options)-one the question button(QB)-the other the submit button(SB)
make a variable (Var) for QB and assign 1 to the correct answers and 0 to the wrong answers.
also add a boolean (BL) to QB and all should have a default of False.
also lets say radio is a sprite (RD).
Also make a sprite (SR) that will show visibility (say it looks like an arrow) when answer has been submitted (when placing SR make it above the correct answers)
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events sheet
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1)2 conditions
on click QB → set QB.BL to True
While Qb.BL == False
2)2 conditions
on click QB → set QB.BL to False
While Qb.BL == True
3)3 conditions
on click SB → set RD.color to Red
While Qb.BL == True → set SR visibility to visible
While QB.Var == 1
4)3 conditions
on click SB → Set RD.color to Grey
While Qb.BL == True → set SR visibility to visible
While QB.Var == 0
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hope this what u want
also i hope you understand this
ill make a pic-
m8n not be r8
Radkampfwagen