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Definitely C. B has a lack of parrallellism and 2 incorrect uses of pronoun. "Due not to their faster production lines ... but a greater amount of engineers and... " If the first part of the sentence talks about "their" then second part must do the same for sake of parrallellism.
Next, you don't say a greater amount of engineers since they can be counted. Amount is used when you cannot count the subject such as a greater amount of money ( you cannot count exactly how many coins and bills you have ) or a greater amount of sugar.
Finally, the second half of that same sentence is as if the greater amount is applied to equipment per production worker as well. Again, equipment worker can be counted and must not be used with amount. More, or greater number should be used here.
Actually I did think that E could be the answer. I was confused between C and E.
"faster production lines" in C conveys the meaning that the production lines are "faster" which does not make sense, if you think about it. Production lines are not moving to be faster or slower, the "speed" of production lines can be faster or slower.
I guess thats why E is the answer.