Re: The breath of life
Literally, Adam is the only one. Eve was life created from life. She was the first created being that was life from life. She is the image or picture of believers being created from His Life. We share His eternal life. It is an incredible thought that eternal Life, without beginning, and without end, unites in us so that we too become eternal with Him.
Adam became a living soul when God breathed into him. Everyone after that was a living soul because they were created from Adam. One could probably say that God's breath into Adam is passed on to Eve and all her offspring for all of them are living souls. I wouldn't argue the point either way.
I chose Adam because he was literally (i.e. in a literal sense) the only one. But i think a case could be made for each answer you provided. Not sure how I would respond if we also include the spiritual part of it, or just the physical part (i.e. breathing means alive). Interesting question.
13 "But go and learn what this means: ' I DESIRE COMPASSION,AND NOT SACRIFICE,' for I did not come to call the righteous, but sinners."