Concept:A paragraph arrangement question requires identifying the logical flow: introduction, then details, then supporting facts.
Explanation:Statement C introduces the topic: Nanyang Technological University (NTU) has released a video.
Statement D follows naturally because it tells what the video shows: an autonomous robot assembling an Ikea chair in 8 minutes 55 seconds.
Statement A gives more details about the robot itself — it has a 3D camera and two robotic arms with grippers.
Statement B provides an additional fact: before assembly, the robot took 11 minutes and 21 seconds to plan its motion pathways.
Thus the correct order is C → D → A → B, which corresponds to option 4 (CDAB).
Answer:Option 4 (CDAB)