[A]
the tail of the comet always exists in the same orientation.
[B]
as the comet rotates around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone.
[C]
as the comet rotates, the lighter mass of the comet is attracted by some stars situated in the direction of its tail.
[D]
the radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun