How do I make it shorter?

Question

I have several buttons (A, B and C), each one when pressed calls a different function, but they all do practically the same but with different value. How do I do this with only one function instead of three?

Example:

HTML:
<button id="A">A</button>
<button id="B">B</button>
<button id="C">C</button>

JavaScript:
var Selected = "A";

function main(){
$("#A").on("click", A);
$("#B").on("click", B);
$("#C").on("click", C);
}

function A(){
if(Selected!="A")
Selected = "A";
}

function B(){
if(Selected!="B")
Selected = "B";
}

function C(){
if(Selected!="C")
Selected = "C";
}

Answer 1

Or

function onSelect(ev){
var id= ev.currentTarget.id
if(Selected != id)
Selected= id
}

and assign to A, B, C same callback (onSelect)

Answer 2

Thanks you KrOW!

Answer 3

I've made a demo code
https://code.sololearn.com/WRvzQ9inSV9n/#html