What Is the Major Difference Between the Terms 'Thought' and 'Cognition

What is the major difference between the terms 'thought' and 'cognition' as used by social psychologists?

A) There are no differences; the terms are always used interchangeably
B) Thought is often conscious or at least we are often aware of it, whereas we are unaware of cognition and it takes effort to notice it
C) Cognition is the internal language and symbols we use; thought refers to largely automatic mental processing
D) Cognition is often conscious or at least we are often aware of it, whereas we are unaware of thought and it takes effort to notice it