so to pick the random sound I would do this
set global string pickedConsonant to: choose(ba,cha,ga,ha,...)
to play the correct audio assuming it has the same name:
play audio by name: pickedConsonant
now create the answer image assuming they have the same name
create object by name: pickedConsonant
so now create the wrong answers
repeat 3x
create object by name: choose(ba,cha,ga,ha,...)
to compare if the player has selected the correct answer you can compare the name of the clicked image with the string pickedConsonant