Dustbin containing discarded material was left uncovered for sometime. Amount of different materials and factors related to them changed during these days which were plotted in the given graph.Select the correct option regarding this.

• A. Q could be tin can.
• B. P could be decomposer microbes and R could be fruits and vegetables peel.
• C. P could be organic waste whereas S could be discarded syringe.
• D. All of these