Match the method of concentration of ore in Column $I$ with the ore in Column $II$.
$I$ (Method) $II$ (Ore) $(I)$ Magnetic separation $a. Cu_2S$ $(II)$ Froth flotation $b. FeCr_2O_4$ $(III)$ Gravity separation $c. Al_2(SiO_3)_3$
| $I$ (Method) | $II$ (Ore) |
| $(I)$ Magnetic separation | $a. Cu_2S$ |
| $(II)$ Froth flotation | $b. FeCr_2O_4$ |
| $(III)$ Gravity separation | $c. Al_2(SiO_3)_3$ |
- A$I-a, II-b, III-c$
- B$I-b, II-a, III-c$
- C$I-c, II-a, III-b$
- D$I-b, II-c, III-a$
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