"Primitive" refers to something that is simple, basic, or undeveloped. On the other hand, "Sophisticated" implies complexity, refinement, and advanced development. Therefore, option (C) Sophisticated is the opposite or antonym of "Primitive."

In the context of the sentence, "liberal" is used to describe policies that are open to change and progress. The opposite or antonym of "liberal" in this context is "conservative," which implies a preference for maintaining existing traditions and resisting change. Therefore, option (B) conservative is the most appropriate antonym.

"Insatiable" refers to an inability to be satisfied or appeased. The opposite or antonym would be "Fulfilled," indicating a state of being satisfied or content. Therefore, option (B) Fulfilled is the most suitable antonym in this context.

"Agitate" means to disturb, excite, or make anxious. The opposite or antonym would be "Soothe," which means to calm or pacify. Therefore, option (D) Soothe is the most suitable antonym in this context.