What does kHz mean?

You’ve been asked to convert a WAV file to an MP3 file with a rate of 44.1kHz. What does this mean?

A) The MP3 file needs to be exactly 44.1 kilobytes in size.

B) The MP3 file needs to have 44,100 samples every second.

C) The MP3 file bit depth should be 44.1 kHz.

D) The MP3 file should have a compression ratio of 44.1 to 1.