[单选题]
The gravitational attractivj/-zij m7 u rb(n-uav(e force between two masses is F. If ne, odk;97c 1lzx*d2h1am2kv/lcr i wthe masses are moved to half of their initial distance, what is the graw2 dvhr 1,kolzaex dl*c9 1 ki/n2m7c;vitational attractive force?
