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GWD 逻辑That the application of new technology can increase th

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GWD 逻辑
That the application of new technology can increase the productivity of existing coal mines is demonstrated by the case of Tribnia’s coal industry.Coal output per miner in Tribnia is double what it was five years ago,even though no new mines have opened.
Which of the following can be properly concluded from the statement about coal output per miner in the passage?
If the number of miners working in Tribnian coal mines has remained constant in the past five years,Tribnia’s total coal production has doubled in that period of time.
Any individual Tribnian coal mine that achieved an increase in overall output in the past five years has also experienced an increase in output per miner.
If any new coal mines had opened in Tribnia in the past five years,then the increase in output per miner would have been even greater than it actually was.
If any individual Tribnian coal mine has not increased its output per miner in the past five years,then that mine’s overall output has declined or remained constant.
In Tribnia the cost of producing a given quantity of coal has declined over the past five years.
why the others are incorrect:
B.because the word 'individual' is used,this option is 'too absolute to be right' (one of my golden rules in doing multiple choice)--more logically,a Tribnian mine may have increased overall output because it employed more miners,instead of using new technology,isn't it?
C.logically,if you open a new mine,the productivity (output per miner) of other mines remain unchange,because they have nothing to do with the new one!
D.same rule as B--also,a particular mine can have lower productivity and more labour at the same time,and the overall output can be higher,lower or remain the same,--overall output = no.of labour X output per miner
overall,this leave us A,which is not too absolute,and logical