Study the given flow chart and identify P, Q and R.
| P | Q | R | |
| A | Livestock wastes | Styrofoam cup | DDT |
| B | Garbage | BHC | Aluminium cans |
| C | Sewage sludge | DDT | Styrofoam cup |
| D | Livestock wastes | BHC | Grocery |
Styrofoam cup is not recyclable...then how come is the correct answer is A.It should be c