What Is the Difference Between Rationalist Methods and Constructivist Methods

What is the difference between rationalist methods and constructivist methods?

A) Rationalist methods see causation as mutual, while constructivist methods see causation as sequential.
B) Rationalist methods apply labels to facts, while constructivist methods do not.
C) Rationalist methods see causation as sequential, while constructivist methods see causation as mutual.
D) Rationalist methods posit that events are caused by external factors, while constructivist methods assert that events are caused by both external and internal factors.