| Ram classified a list of materials into two groups as given below. |
| Group1: iron, steel, stone, brick, diamond, wood |
| Group2: sponge, wool, candle wax, butter, cotton |
| Which of the following basis of classifications did he choose for grouping the materials? |
A) Living and non-living
B) Shiny appearance and dull appearance
C) Hardness and softness
D) Transparency and opaqueness
E) None of these
Correct Answer: C
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