Radio buttons are not ideal in your case since they are use for multi-selection (in theory, one can choose `none of the above` and another option - while Javascript can 'fix' this, it's not exactly obvious for the users).

I may not be answering your question directly, but consider this format instead:

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![mockup](https://i.sstatic.net/XvFdF.png)

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I think it'll serve your client better because it requires users to explicitly say `no` to each item.

The controls are radio buttons and per line only one can be selected. You can start with neither ticked to force user action, saying no.