The Standing Waves in Air in a Pipe of Length $\lambda$

Multiple Choice

The standing waves in air in a pipe of length L that is open at one end and closed at the other have a speed v.The frequencies of the three lowest harmonics are

A) v/4L,v/2L,and 3v/4L
B) v/2L,v/L,and 3v/2L
C) $\lambda$ /4, $\lambda$ /2,and 3 $\lambda$ /4
D) v/4L,3v/4L,and 5v/4L
E) $\lambda$ /3,2 $\lambda$ /3,and 3 $\lambda$ /3