When Ann went to her doctor, he gave her a hearing test. During the test, the doctor presented tones to Ann through earphones. The tones varied only along the loud-soft dimensions (from very loud to very soft). The doctor asked Ann to raise her hand whenever she heard a sound. The doctor was testing Ann's .

Absolute threshold

Explanation:

When Ann went to her doctor, he gave her a hearing test. During the test, the doctor presented tones to Ann through earphones. The tones varied only along the loud-soft dimensions (from very loud to very soft). The doctor asked Ann to raise her hand whenever she heard a sound. The doctor was testing Ann's absolute threshold .The minimum intensity of physical stimulation required to produce any sensation at all in a person is the absolute threshold

a is the answer because it just is

answer; for children with two myopic parents,the likelihood of becoming myopic is ) correlated with the number of hours spent playing sports each week;