Astin Believes That People Will Be More Persuaded by an Argument

Multiple Choice

Astin believes that people will be more persuaded by an argument if the person presenting the argument is tall,rather than if the presenter is short.Astin wants to test her belief in an experiment.In this instance,Astin should state her null hypothesis as

A) a presenter's height will have no impact on persuasion.
B) a short presenter will be more persuasive than a tall presenter.
C) a tall presenter will be less persuasive than a short presenter.
D) a tall presenter will be more persuasive than a short presenter.