Frank is looking for his girlfriend in a large crowd of people. Because he is so focused on finding her, he fails to notice when a man in a clown costume walks by, despite looking directly at him. This is an example of:

a. a feature detection failure.

b. sensory overload.

c. sensory adaptation.

d. inattentional blindness.

D

Explanation:

"Also known as perceptual blindness, inattentive blindness results from a lack of attention that is not associated with vision defects or deficits, as an individual fails to perceive an unexpected stimulus in plain sight."- google

Basically when a person is focused on a task they unintentionally fail to notice other things.  

true

explanation:

agreeableness is a personality trait manifesting itself in individual behavioral characteristics that are perceived as kind, sympathetic, cooperative, warm, and considerate.