Aman in a gorilla suit rode through campus in a tiny clown car singing loudly. he was part of a psychology experiment, and student researchers interviewed people who had been in the same area. they found that no one who had been talking on a cell phone had noticed this even though it was within a few feet of them. this is an example of:

Inattentional deafness.

Explanation: Inattentional deafness is the situation that is caused when the people tend to fail in hearing the audible sounds in the surrounding due to the circumstances of workload. The attention towards any event happening in the surrounding goes unnoticed by them in such cases.

The situation mentioned in the question states about the inattentional deafness of people because they were talking on the cell phone and thus are not able to notice the gorilla-suited man and the loud singing car.

a: social security and social programs