Which of the following affects the speed of a planet's revolution? shape of the planet gravity of the sun temperature of the sun atmosphere of the planet

I would say B) because the rest dosnt quite make sense to me and A) the  gravity of the sun would still be the same despite the shape if we have an triangle block and  an sphere then drop the they are going to drop at the same speed the gravity is not going to sphere is not going to fall faster 

Is there any answer choices?