2. Celine entered the room of her younger brother trying to look for her old notebook. But she was dismayed because the room was a mess. After few hours, the room turned into clean, tidy and the materials there were already neatly organized. She also found the old notebook she was looking for. What technique of separating mixture did she apply to organize them? A. Handpicking B. Using magnet C. Sieving D. Filtration​