Introspection Was One of the Earliest Methods for Studying Internal

Introspection was one of the earliest methods for studying internal phenomena. Why are most modern psychologists wary of introspective data?

A) Words describing our own internal states are often hard to interpret.
B) When we think about our own mental processes, we tend to be unrealistically negative in our self-appraisals.
C) It is too time-consuming to gather data using introspection.
D) All of the above answers are correct.