Final answer:
A belief based on previous knowledge is called an acquired belief. Belief systems serve as a foundation for acquiring additional beliefs, and the Coherentist Theory of Truth states that new ideas are accepted as true if they are consistent with previously acquired beliefs. Therefore, the correct option is D. an acquired belief.
Step-by-step explanation:
A belief based on previous knowledge is called an acquired belief. Once acquired, belief systems serve as a foundation for acquiring additional beliefs. The Coherentist Theory of Truth states that when new ideas are presented, they are accepted as true if they are consistent with previously acquired beliefs. However, it is important for belief systems to be supported by external evidence in order to ensure their accuracy and reliability.