Blebbistatin effect on vesicles
Blebbistatin inhibits myosin II by blocking it's attachment with actin. Myosin II and other actin based motors have shown to be involved in vesicle budding from trans golgi network. Given this information, I think correct answer will be 


  The formation of vesicles would cease.


Following cartoon from (Stow et al 1998) shows proposed mechanism,



However looking at this paper, option (2) The movement of vesicles within the cell would cease, also sounds reasonable.