"dad, have you seen my new slipper? " gwen asked as she hobbled into the dining room. her father looked up blankly from his tax paperwork that was strewn across the length of the dining-room table. his reading glasses rested on the end of his nose, and he raised his eyebrows so he could peer over the lenses to see his daughter. "come again? " he enquired. "my slipper," gwen replied as she perched with one foot snugly inside a black furry slipper and her other foot clasped awkwardly in her hand. although he was sitting in the middle of what looked like a battlefield where two file cabinets declared war on each other before they exploded, her father smiled warmly. "so, are you cinderella now? " gwen nearly toppled over with giggles. "dad, i'm serious. i bought these slippers yesterday, and now there's only one. and my foot is freezing inside my sock." "are you trying to find it before it turns into a pumpkin again? " her father suggested with a sideways grin. as she looked around the room and carefully scooted a couple of chairs back from the table, she replied, "i think maybe there's a black hole somewhere in our house, and it decided to eat my new slipper." "but what do black holes really need in their diet nowadays? " her father asked as he slowly removed his reading glasses. he laughed as he added, "speaking of food, i haven't heard a peep from samantha's room in a while, but i suspect it may be because i've been occupied here. oh, and don't move too many of my files around there. are you sure you lost your slipper in here? " gwen hopped back from the table and said, "i don't even remember being in here today. samantha and i have been so busy playing with that new kitten we found yesterday." her father crossed his arms and said, "come to think of it, she did tell me earlier that the kitten needed a bed. have you asked her if she's seen your slipper? " he rose from his chair and marched out into the hallway while gwen followed lopsidedly. "let's go ask her together," he added. "it's time for us to talk about dinner plans, anyway." with a quick knock and a creek, he opened the door to samantha's room. " be quiet because the kitten is sleeping," samantha said with a frown. "my slipper! " gwen exclaimed as she saw her younger sister cradling the black furry slipper in her arms. the siamese kitten, nestled inside the slipper, suddenly awoke and trilled. laughing, the girls' father said, "well, i suppose it's only fitting that we have a cinderella and a sleeping beauty both under one roof."

which sentence best exemplifies foreshadowing in the story?

a. "i think maybe there's a black hole somewhere in our house . . " b. "but what do black holes really need in their diet nowadays? " c. "come to think of it, she did tell me earlier that the kitten needed a bed." d. "i bought these slippers yesterday, and now there's only one