Well, all three are possiblilities. But I don't think 1 and 3 support abortion.
For reason 1, abortion usually deals with the well being of the mother. A mother might kill their child just to get it into heaven, but what about the mother? Their well being will not end up being "well" after all.
For reason 3, just give the child up for adoption.
My Conclusion: All three reasons you gave are valid. But I think the best answer one can give is a humble one, meaning: God knows what He is doing and His judgements are perfect. We are finite creatures, and God's ways are not our ways, they are higher (Isaiah 55:8,9).