The correct answer is:
**E.** One relied on multilateralism and the other was unilateral almost to a fault.
Explanation:
1. **George H.W. Bush (41st President)**: He tended to follow a more multilateral approach in foreign policy, working with other countries and international organizations to address global issues. For example, he built a coalition of nations to push back against Iraq's invasion of Kuwait in 1990.
2. **George W. Bush (43rd President)**: He, on the other hand, pursued a more unilateral approach, especially in the context of the Iraq War in 2003. His administration was criticized for bypassing international institutions like the United Nations and acting independently.
This distinction showcases the difference in their foreign policy doctrines, with one emphasizing multilateralism and cooperation while the other leaned towards unilateral action.