Observe the given pictures and select the option that correctly groups them.
| Pleasant sound | Unpleasant sound | |
|---|---|---|
| A | 1, 3, 5 | 2, 4, 6 |
| B | 2, 4, 5 | 1, 3, 6 |
| C | 1, 2, 3 | 4, 5, 6 |
| D | 4, 5, 6 | 1, 2, 3 |
what is happening in no.5
what is happening in no.5