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.  

answer; the correct answer to the above statement is to increase the production of milk in a herd of milk cows, the highest producing cows were chosen as the mother;

im sorry i wish i can but try google