Question #4:

Answer by selecting the choice which reflects a proper paragraph arrangement of the sentences presented. 1. It shut down three nuclear reactors that were still reducing plutonium for nuclear arms. 2. These moves will help reduce and secure the volume of fissionable material in circulation - thereby eliminating the chance that other countries with nuclear ambitions can get their hands on that material. 3. Amid all the talk about renewed rivalry, Russia this week took two welcome steps toward nuclear cooperation with the U.S. 4. And it agreed to mutual monitoring of nuclear storage sites where both countries will store plutonium extracted from the dismantled warheads.