An object vibrates with a frequency of 10 Hz. Which of the following is true?

The average frequency range the human ear is sensitive to is called the audible range. The audible range of sound for human beings is from 20 Hz to 20,000 Hz.
Because humans can hear sounds easily in the frequency range of 20 Hz to 20,000 Hz, the frequency of 10 Hz cannot be heard.

So, the correct option is "It produces sounds that we cannot hear".