Final answer:
Aristotle rejected Plato's theory of the Forms due to the challenges he found in their ability to influence material entities and the emphasis on particulars rather than otherworldly forms. He introduced the concept of the four causes as an alternative framework.
Step-by-step explanation:
Aristotle rejected Plato's theory of the Forms for several reasons. Firstly, he questioned how immaterial forms could influence material entities. If forms lack matter, how could they cause change in physical objects? Secondly, Aristotle emphasized the importance of particulars, individual instances of entities, rather than focusing on otherworldly forms. He believed that knowledge of forms could only be acquired through observation and understanding of specific instances. Lastly, Aristotle introduced the concept of the four causes, which provided a different framework for understanding the nature of things.