Why choose an abortion over an adoption?

This question is not intended to be as controversial as you are probably thinking. Please, no political debate. I am genuinely seeking feedback, largely from the ladies, as to why an abortion would be chosen over permitting the full term and delivery, then adopting the child out. Obviously, this excludes when the fetus will not survive to full term. Please, no political debate here. This should start from the basic understanding that at a minimum abortion is the termination of what has the potential to be a human life, and at a maximum is murder. Then why are so many more pregnancies ending in abortion than adoption? This is a sincere request for honest feedback.