The correct option is A shattered
The sentence is about the effect a 'bad exam result' has on 'her dreams'. Since the results were 'bad', the effect is negative. From the given options, the word 'shattered' means 'destroyed or broken into fragments'. As her dreams were negatively affected due to the bad results, we can say they were destroyed or 'shattered'. This word is most appropriate in the context, hence option B is correct. 'Fled' means 'to have run away from'; her dreams cannot run away from her, hence this word is not the correct answer and option A is incorrect. 'Fulfilled' means 'satisfied or happy that something has been achieved or done'. This word is used when the dream has been achieved by the person. As it hasn't in this sentence, option C is incorrect. 'Floating' means 'to be drifting about.' This word is not appropriate in the context of the sentence, as the person's dreams cannot be floating. So, option D is incorrect.