Answer
Pipe B has one open end.
Work Step by Step
Note that $~~1.4 = \frac{7}{5}$
We can write an expression for the frequencies in a pipe that is open at one end:
$f = \frac{nv}{4L},~~$ where $~~n = 1,3,5,...$
Therefore, the two frequencies must be the fifth and seventh harmonics of a pipe with one open end.
Pipe B has one open end.
