A Radio Galaxy Whose Lobes Are Swept Back as If

Multiple Choice

A radio galaxy whose lobes are swept back as if forming a tail.This probably indicates that:

A) this is evidence for intergalactic matter.
B) the galaxy is about to evolve into a spiral.
C) the galaxy is isolated, not part of a cluster.
D) the galaxy is moving towards Earth.
E) there must be another galaxy nearby.