A ball is thrown from the top of a building, and each time the ball bounces to half of its previous height. If the height of the building is $$1024m$$, what is the height it bounces to on the fifth bounce? 
选项为:A:$$32m$$  B:$$16m$$  C:$$128m$$  D:$$256m$$  E:$$4m$$  请回答其中一个选项.