A) quartz and about four points more than the hardness of - INCORRECT- diamond being compared to quartz and hardness of steel -
B) quartz and about four points more than that of - INCORRECT as points or steel is repeated by mentioning 'that of'
C) how hard quartz is and about four points more than the hardness of - INCORRECT as number compared to quality of hardness
D) the hardness of quartz and about four point more than the hardness of - INCORRECT as number is compared to hardness
E) quartz
...
B) quartz and about four points more than that of - INCORRECT as points or steel is repeated by mentioning 'that of'
C) how hard quartz is and about four points more than the hardness of - INCORRECT as number compared to quality of hardness
D) the hardness of quartz and about four point more than the hardness of - INCORRECT as number is compared to hardness
E) quartz
...




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