Prevent customer from removing option in cart

I have a product set up with 3 options (Left, Right or Both), see hielspoorinfo.nl/webshop/product/40-baue...iscospot-hielkussen. Option Both has an additional price, the others not.

When adding this product to Cart always one of these options needs to be chosen. However, once added to the cart, it is shown as a separate 'product', and sometimes customers tend to remove it from the cart. I need to have this linked, so that if the option is removed, the product itself get's removed as well.

How can this be done? Or is there a way to set this up in such a way that the option is not shown in the cart as a separate option, but as one product which is simply more expensive?

Hi simonkloostra,

In your case, it better to use the Variants instead of the Options.
With the variants, you can set an additional price to the "Both" variant, and in the cart there is no separate product, just one with a variant.

This is how I initially thought it would work, but checking the documentation told me I should set up an option. Anyhow, I tried to do this the suggested way on a test-site, but it doesn't work.
If I set the price for a variant, the screen jumps to the "variant" as soon as I select it, see both screen prints, before and after selecting