When we think we are interested in knowing someone and think about approaching them, especially someone from outside our racial or social group, we assume our body language will show our interest. this is an example of:

Illusion of transparency.

Explanation:

This is a social tendency that occurs when people overestimate how much their mental state is known by others. In your example, a person may assume that the person he is trying to approach, is completely aware that he is nervous, insecure, or afraid to talk when this could not be the case at all.

This occurs due to the natural egocentric inclination present on human beings, which leads us to use our own perspective of the world to determine how others view it.

answer; i do believe its (b) 12.5 years of age;