When you select the product, option A shows in the preview image ( .rg-image ) by default. That's perfect. 

LOLWHAT?

When you select option B thumbnail ( .rg-thumbs ), then option B shows up in our preview as expected, however, when you choose option B in the product selector, the .rg-image updates appropriately, but when you mouse over the .rg-image then option A is the product that zooms in and not the actual selected Product B.