ENGLISH LITERATURE (CBSE/UGC NET)

(1)"Doesn’t she ever have to go home?” (2)"This is her home, and yours, and Daddy’s.” (3)"Why?” (4)Because she is married to me now, Nick. (5)She is my wife, and husbands and wives love each other and live together in the same house.” (6)There was a pause, and when I spoke again, what I said must have been very different from what they expected. (7)They did not know that while I was away on holiday at the sea I had been taken, one rainy afternoon, along with the other children, to the cinema. (8)There I had seen, in all the rose and crystalline blur of Technicolor, a man and woman dance out beneath the chandeliers of a ballroom. (9)When I had asked what they were doing, I was told that this was a wedding ____ the man and the woman had just been married. (10)"Do you mean like this?” I asked my father and my stepmother, taking my father’s hand, bending my knees, and shaping out my arms in a jig-like posture. (11)I hopped around solemnly, dragging him with me. (12)"Dancing?” guessed my father ____ (13)"Oh, that’s wonderful!” she cried in sudden delight ____ (14)I was now nearly five years old and due to begin going to school.Which sentence marks the beginning of the flashback in the passage?