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C.P12 may 2012 q1 explain
D is too large, a thousand micrometer is 1mm!
That would mean we would be able to see cells with naked eyes!
10 to 100 micrometer range is correct, seeing as one of the largest cells in humans is the egg cell, which may have diameter of 0.1mm. (which is 100 micrometer. It is important to learn the sizes!)
You'd not choose B and definitely not A, because you know mitochondria have size of one micrometer.