I don’t think there’s a quick way to get link B, but C is literally called the canonical URL. Check the <head> section in the HTML.
Remember that posts belong to users, the community only does a retweet/boost of the post.
More info: github.com/LemmyNet/lemmy-ui/issues/1418
sk1nnym1ke@piefed.social 5 days ago
At this moment the web interface doesn't support this.
I use the app Voyager on my smartphone. I can set in the settings that the share link target links to A, B, C by default or that the app asks me everytime.