Threaded comment in HTML5

When dealing with threaded comments on a blog in HTML5 would you expect “threaded responses” comments to be nested <article>’s ? Or would you consider even the “threaded responses” simply another <article> within the scope of the blog post <article>?

Example A:

<section>
    <article>
        ...blog post...
        <section id="comments">
            <article>...comment 1...</article>
            <article>...comment 2...</article>
            <article>...comment 3 in response to comment 2...</article>
            <article>...comment 4 in response to comment 2...</article>
            <article>...comment 5 in response to comment 4...</article>
            <article>...comment 6...</article>
        </section>
    </article>
</section>

Example B:

<section>
    <article>
        ...blog post...
        <section id="comments">
            <article>...comment 1...</article>
            <article>
                ...comment 2...
                <article>...comment 3 in response to comment 2...</article>
                <article>
                    ...comment 4 in response to comment 2...
                    <article>...comment 5 in response to comment 4...</article>
                </article>
            </article>
            <article>...comment 6...</article>
        </section>
    </article>
</section>