【单选题】I was about to make my little bow of assent, when the meaning of these last words sank in, jolting me out of my sad reverie. (Para. 18)
A.
When I was about to nod my head to show my agreement, suddenly the meaning of the mayor’s words were understood , which surprised me from my daydreaming.
B.
I was about to bow to show my agreement, at that time the meaning of these last words fall down, jolting me out of my sad daydream.