The relative hardness of five minerals N, o, R, S, and T is,to be determined. One mineral is harder than another if drawing an edge of the first mineral across a surface of the second mineral produces a scratch; otherwise, the first mineral is either equally hard or, not as hard as the second. The following results have so far been obtained. N scratches O R scratches S O does not scratch T. Which of the following could be the five minerals in order from the hardest to the softest if no two of them are equally hard?

A N,T,S,O,R

B N,R, T,S,O

C R, N,O,S,T

D R,O,S,T, N

Solution

Correct Answer: Option B

Solution

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