Refer to the given flow chart showing energy conversion and select the option that correctly identifies P, Q, R and S.
| P | Q | R | S | |
|---|---|---|---|---|
| A | Car | Solar cooker | Windmill | Radio |
| B | Fan | Nuclear power plant | Car | Sleeping |
| C | Microwave | Radio | Climbing | Reading |
| D | Bulb | Grass | Electric fan | Bomb |
Huh