Study the given flow chart carefully. Which one of the following options correctly describes the properties R, S and T in the chart?
| R | S | T | |
| A | Allows light to pass through | Conducts electricity | Fragile |
| B | Fragile | Allows light to pass through | Flexible |
| C | Flexible | Conducts electricity | Hard |
| D | Conducts electricity | Fragile | Allows light to pass through |