I bet the money was so she could get a cab home after grocery shopping . Argh , having $ 50 would have been nice . But knowing I probably made a difference in someone 's week is nicer . Still , the feeling of finding an envelope full of money .

OPTIONS: a). She cab home first before grocery shopping .; b). she will cab home after grocery shopping .; c). None of the above choices .; d). The amount was less for both cab home and grocery shopping .;
Answer the following question: What was the need of money ?
b).