The tail of a comet is directed away from the sun because

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