What Is One of the Purposes of the "Surprise" Factor

What is one of the purposes of the "surprise" factor in the proposal ritual?

A) Usually, the woman has no idea that a marriage proposal is even imminent, so there is always a question of doubt if she will accept or not.
B) The surprise allows the woman to respond spontaneously to the man, which captures an outpouring of emotion that indicates the true significance of the event.
C) Since both the man and the woman actually know that the proposal is coming, the surprise element only serves as a dramaturgical ritual that has little meaning to either participant.
D) Only women are taken up in the moment, but men report that since they have done the planning, the surprise element has little meaning to them.