This passage from chapter 4 of The Story of My Life is an example of whích stage of plot?

The most important day I remember in all my life is the one
on which my teacher, Anne Mansfield Sullivan, came to
me. I am filled with wonder when I consider the
immeasurable contrasts between the two lives which it
connects. It was the third of March, 1887, three months
before I was seven years
old.

O A. Conflict
O B. Exposition
O c. Climax
O D. Conclusion