Match the reagents in Group 1 with their properties in Group 2, in the context of froth floatation.
| Group 1 | Group 2 |
| P. Frother | 1. Alters the chemical nature of mineral surfaces so that they become hydrophobic due to action of collector |
| Q. Activator | 2. Absorbs on air-water interface and reduces surface tension to stabilise the bubble |
| R. Regulator | 3. Increases the selectivity of floatation by rendering certain mineral hydrophilic |
| S. Depressant | 4. Modifies the action of collector either by intensifying or reducing its water repellant effect |
A. P-2, Q-1, R-4, S-3
B. P-1, Q-3, R-2, S-4
C. P-4, Q-2, R-3, S-1
D. P-3, Q-2, R-4, S-1
Answer: Option D
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