Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-155
Section: Logical Reasoning
Topic: Assumption
Difficulty level: Hard

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Charcoal burner: We cut the vents to half for the last two kilns and drew forty percent more charcoal from a cord than the open-vent firings gave. In an open firing half the wood goes to heat the rest. The retort men report better yields, but their coppice was cut two summers back and ours last winter. So cutting the vents is at least part of what lifted our yield.

Which one of the following is an assumption the burner's argument requires?

AThe last two kilns differed from the earlier open-vent firings in nothing else that would raise the charcoal drawn from a cord, so that the vents are the one change left to credit

BHalving a kiln's vents raises the charcoal drawn from a cord by something near forty percent in any kiln fired as this burner fires his, whatever wood is in it

CRetort men working coppice cut only last winter draw no more charcoal from a cord than this burner drew from the two kilns he fired with vents halved

DA cord of the wood that went into the last two firings held no more burnable wood in it, before either was lit, than a cord of the wood that went into the open-vent firings

ECharcoal from a firing with the vents cut to half serves a forge as well as charcoal from an open firing

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