At the beginning of the twenty-first century, some people placed signs with crudely painted skeletons holding cell phones near roadways, usually facing freeway ramps. these signs indicated disapproval of using cell phones while driving, a practice some states have now made illegal. as a result of this social movement : group of answer choices : a) there are no formal sanctions that can be used to enforce the norm of not talking on a cell phone while driving. b) an informal norm has become a law. c) talking on a cell phone while driving is taboo. d) almost no one violates the norm of not talking on a cell phone while driving.