What was one of the main reasons for the change in architectural style in eighteenth century North America a. More architects arrived in the colonies. b. The colonists developed an interest in classical architecture. c. Bricks were more readily available. d. The colonists had more money to spend on housing.

传播效果是指传播者所发出的信息对传播对象的影响和传播对象对传播内容的反应。