Choose the option in which the prepositions complete the verb phrases, respectively:

1. I. The problem stems ________ the government’s lack of action.
   

2. II. When I asked Jean, she hinted _____ the chance of a promotion for me.
   

3. III. The salesman was responsible _______ the accident.
   

4. IV. Please, refrain_______ smoking in the lecture lounge.
   

5. V. I can’t stand the way she is always boasting ______ her wealthy parents.