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?

A. 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.
B. 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.
C. 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.
D. 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.
E. In Tribnia the cost of producing a given quantity of coal has declined over the past five years.

Be clarify your question or concerns about this problem. We can help you best if we know why you're struggling!

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Emily Sledge
Instructor
ManhattanGMAT

is the answer c?

What is OA?

I chose A using the following POE

B - Not necessarily true
C - Not relevant
D - Negating the cause and effect (trap answer)
E - Negating the argument.

Can any instructor confirm if my POE reasons are valid?

Thanks

A is correct and I'll reference Ron's post for the explanations:

post38001.html?sid=cd2f0df85cb72bfe80995ad054b55676#p38001

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Joe Lucero
Manhattan GMAT Instructor