You Are the Owner of an Organ with Open -

You are the owner of an organ with open - ended pipes. You notice, though, that one note is fairly far off from its target frequency. You take the organ apart, only to find that the one organ pipe making the bad note is closed, not open! Closing the organ pipe made the frequency of the note it produces

A) go up by an octave-its frequency will increase by a factor of 2.
B) go down by an octave-its frequency will decrease by a factor of 2.
C) stay the same.
D) go down by a fifth-its frequency will decrease by a factor of 1.5.