D. precision. At first glance you can mark out A and B because the answers does not relate to the question. If question had said "what do you call it when the measurement is close to the actual answer" then you would have picked C. So that leaves you D. precision.
D. The number increases and then decreases for noble gases
<span>protect it by covering it by lyophilic sol.</span>
3090000000nm
since there's 1m = 1000000000nm
