Option Buttons not grouping together properly

Hello everyone....I have a spreadsheet which has two columns at the end (labelled Option A, and Option B) where I want the user to check off one or the other. When I add Option Buttons to Cell J13 and K13 (first line of text) it works as it should allowing me to select one or the other. The problem is when I add more option button in cells J14 and K14 it will delete the previous selections and starts using all four buttons to select one reply. I have tried grouping each set of buttons together...but that does not seem to work either. Does anyone know what I am doing wrong?
I have attached a blank copy of the file for review....any help is greatly appreciated.