Answer:
I'm not too sure what the Johari Window is, but I'm going to guess it's D, because she's doesn't know, so it's unknown to her. Sorry if that's wrong
A, because all the other are in direct reference to something
The speaker thinks (feels) that her daughter is growing up very fast and uncontrollably, so the speaker feels a wistful feeling towards past years in which her daughter was young and just learning to ride a bike, and the speaker wishes her daughter to remain forever in her chidlike state and never grow up.