Carl and Sophia are indeed deceased in The Walking Dead comics. Their fates were determined by the story's progression and the challenges the characters faced in that post-apocalyptic world.
Sorry to say, Sophia isn't alive. The plot and circumstances in the comic didn't allow for her to continue. It's a harsh but integral part of the comic's narrative.
Definitely. Abraham's death was a significant event in the comics. It happened during a tense and dangerous situation that had major implications for the story.