The life of a mother and the life of her child are equally sacred: if the mother's life is truly in mortal danger due to her unborn child and there is no way to save both the mother and the child then you have reached a point where abortion is permissible.
Even then the best practice would be to attempt to save both lives.
And in practice the concept of mortal danger to the mother has been watered down by leftists to 'serious harm' - which has proved to be the gateway excuse for 99% of abortions in the UK, rubber-stamped by morally bankrupt doctors.
So in fact the only answer that actually protects the unborn child is A, all the way.