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Is it dental related? See if you can find a few dental schools that would link to the charity with the right anchor text. Lisa is on the money, start with board members that are alumni.

Do they do any fundraisers? Anything interesting or fun? Talk about it and find places to talk about it for you. News loves heart-warming 'fluff' pieces even on the web.

Thought about an infographic? May not get anchor text value, but it could get some good in-bound juice.

Are they a big authority on anything? Do they have a weekly newsletter etc..? publish that to Issuu.com and slideshare.com

Have you looked at comprable charities across the nation? maybe some good links buried in their profiles.

I think that Option D makes the most sense.

1. A would make sense if it were a blog
2. B and C are a little too keyword-spammy.
3. 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.