37. What comment is true about the statement that "the human ear hears sounds originating from vibrating objects with a frequency between 20 and 20,000 Hz"?
a. This is true only at room temperature.
b. About 95 percent hear in this range, while some hear outside the average limits.
c. This varies, with females hearing frequencies above 20,000 Hz.
d. Very few people hear the whole range, which decreases with age.