I have these 4 choices on my product page.

Please Choose:
price per month ( +$90.00 )

price for 3 months ( +$180.00 )

price for 6 months( +$325.00 )

price for 12 months ( +$650.00 )

The problem is that on the website page ALL the buttons are checked, and you cannot un-check any selection, so that when the customer goes to the cart, it shows a total price of $1,680.00. The choices are treated as one unit.

The page is not allowing the customer to select just one choice.

Where do I go to fix this? Thanks!