In a "Dispersive" Medium, Waves Exhibit All of the Following

In a "dispersive" medium, waves exhibit all of the following features except that

A) a wave pulse tends to change shape as it propagates.
B) waves move at a speed that is dependent on wavelength.
C) the phase velocity differs from the group velocity.
D) none of the first three statements is correct.
E) all of the first three statements are correct.