How do i change the value of an instance value individualy?

I have a game where a sprite has 3 instance variables (A,B andC) with a randomized value from 0 to 8.

i want it so that when the sprite is selected, and a global variable (named hold) is equal to any of those three values, it sets that specific value to 0

I tried and it sets every single instance variable to 0 not just the one it equals to

example:

there a re 2 instances of that sprite

1 has A1 B3 C4

2 has A4 B7 C8

when hold=1 it sets both A values to 0 like this

1 has A0 B3 C4

2 has A0 B7 C8

You need to use "Sprite compare instance variable" condition. Something like this:

Mouse On Clicked Sprite 

.. Sprite compare variable A=hold : Sprite set A to hold

.. Sprite compare variable B=hold : Sprite set B to hold

.. Sprite compare variable C=hold : Sprite set C to hold