None of these words fit very well, because none of them collocate with 'take'. I think the answer should be 'approach'. However, if you have to choose one of them, 'attitude' is the best of a bad selection.

My guess would be attitude. Meaning that she will study with an approach that is more positive, enthusiastic and dedicated and so she should do well.

Hello Please can you tell us which you think is correct? thanks :)