Answer:
Cambridge English Dictionary defines "espouse" as "to support an activity or opinion."
2. So, the correct meaning of the "espouse" from the given options is "Support."
Cambridge English Dictionary defines "doctrine" as "a principle or set of principles that are followed by a particular group or in a particular situation."
4. So, the correct meaning of the "doctrine" from the given options is "Principle."
Cambridge English Dictionary defines "precarious" as "in danger because not firmly fixed; likely to fall or suffer harm."
1. So, the correct meaning of the "precarious" from the given options is "Insecure."
