Humans hear best in the frequency range of 20 Hz to 20 kHz, excluding both ultrasonic and infrasonic sounds. The correct answer to which type of sound our ears are best at hearing is 'none of the above.' Our auditory perception does not extend into the ultrasonic or infrasonic ranges. ;
Humans are best at hearing sounds within the frequency range of 20 Hz to 20 kHz. Therefore, the correct answer to the question is 'D. none of the above' as ultrasonic and infrasonic sounds are not within this range. Our ears do not effectively detect these frequencies.
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