#9 - Computer scientist: For several decades, the number of

[lsatstudent99966]

It looks to me like you're putting too much emphasis on causal reasoning here, lsatstudent99966. The facts are that these things are correlated, and the inference is that they are correlated. A causal relationship may be implied in the first sentence, with the doubling in the number of transistors causing the doubling in speed, but answer D has nothing to do with causation. It's just about the correlation. Since doubling the transistors correlates with doubling the speed, and since doubling the speed correlates with doubling the cost, it must be true that doubling the transistors correlates with doubling the cost.

Thank you so much, Adam! I have no more problem with this question!