JQUERY Problem with multiple selects and multiple item boxes

JQUERY Problem with multiple selects and multiple item boxes

I have the following

3 select boxes that have a value from A to C. 
On the right side I have 3 item boxes which are empty.

My select drop down are created depending on the count that i have on my table which is 3 now but can have more than 3.

Everytime that someone clicks on a select and choses from a to c. I need to input the value on the box.

Example, if the person choses A then I put First, B Second and C Third.

My question is that I don't know how to do this change even with JQUERY and how does jquery know which row was clicked on.

I hope you can help me out
Thanks