In a Single Photograph of a Comet and Its Tail

In a single photograph of a comet and its tail, the only direction that one can determine with certainty is the direction

A) in which the comet is moving, from the trailing tail.
B) toward Jupiter because the gravity of this giant planet pulls the tail material toward it.
C) toward the Sun, indicated by the tail direction because gas and dust in the tail are attracted toward the Sun by its gravity.
D) away from the Sun because the tail is pushed in this direction by the solar wind.