A barely noticeable flash of emotion on a person's face, quite different from the emotion a speaker is trying to convey, is called a:. a. substituting expression.
b. micro expression.
c. reciprocal expression. d. complimenting expression.

b. micro expression.

Explanation:

Micro expression is a facial expression which occurs in a flash and is hardly noticeable by others. Most of the times this expression occurs involuntarily and is said to expose our truest emotions.

It is barely noticeable yet it occurs to everyone and cannot be controlled. This is why some people though they keep on smiling and laughing, we can still feel that there is something hidden in their outwardly expressions.

answer to ur question is college b