I think that Option D makes the most sense.
- A would make sense if it were a blog
- B and C are a little too keyword-spammy.
- While E might be okay, the rest of your content and titles should already make clear that your site is for an attorney.
Option D will allow you to make good use of breadcrumbs, and if you do it right, those breadcrumbs will also be displayed in Google SERPs.
In addition, I'd advise that if you aren't already planning on it, get to understand Schema.org markup and make use of the Legal Services and Attorney Schema.org markup formats.
I'd bet that most other sites in that space are not yet marked up with appropriate Schema.org, and if you do it right you will be rewarded pretty well.