ANSWER TO QUIZ
From a theological perspective we can say that God chose Mary to be the mother of Jesus because she, herself, was the Immaculate Conception.
Mary was conceived in her mother's womb without sin when God gifted her parents to embrace in a unitive act of absolute, pure love.
This makes Mary the perfect mother of Jesus.
At her creation, God chose to bestow upon her a “preservative grace,” preserving her, with her cooperation, from all stain of sin, including Original Sin. Thus, she would be a fitting, pure vessel for God the Son to become incarnate, to "take on" flesh.
She was preserved by the grace from her Son's Cross, transcending time to free her at her conception.
Thus, her Son was her Savior before He was born in time.
If that’s confusing, try to ponder it for a while.
It’s a great mystery of faith and a deep one also.