Is it natural to use 謙譲語 after being addressed with 尊敬語?


Can someone please explain why the answer to the following question is a and
not b?

> 今朝の新聞、お読みになりましたか?
>
>   * a. いいえ、 読んでいませんが
>   * b. いえ、お読みしませんでした
>

Is weird to use 謙譲語 after someone has addressed you using 尊敬語? It the reason
simply grammatical i.e.

I didn't read it vs I haven't read it.

Thanks! :)

