Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-091
Section: Logical Reasoning
Topic: Strengthen
Difficulty level: Medium

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Metrologist: Our caesium standard is compared each week with the clocks of four other laboratories, and for two years ours has read hundreds of nanoseconds fast against the average of theirs. Colleagues call this drift in our clock. But the comparison travels over a satellite link whose delay we estimate rather than measure, and that estimate was last revised before the ground station moved. The discrepancy is an artefact of the link, not a drift in ours.

Which one of the following, if true, most strengthens the argument?

AIn a survey of laboratories that had moved a ground station, most reported their delay estimates had needed revision, though only those that had noticed a problem were canvassed.

BThe four other laboratories all keep clocks of an older design, expected to lose a little against a caesium standard over two years.

CThe four other laboratories compare their clocks with one another as well as with ours, week by week.

DOf the four other laboratories, the one whose comparisons are routed around the station that moved shows no such weekly offset; the three routed through it do.

EA station that moves as this one did alters the link delay by a few nanoseconds, and no laboratory revises its delay estimate more than once a year.

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