Discussion
This passage says that early instruments for measuring earthquakes were .................... .
Answer: C
The key gives not sensitive enough.
The passage describes the first devices, rods of different lengths standing on end like ninepins, and then says instruments far more delicate than that were needed if any really serious advance was to be made. The rods gave only a crude indication, whether and which way they fell, and could not trace the movements as the quake passed. Calling for 'far more delicate' instruments says the early ones lacked the delicacy, in other words the sensitivity, serious study needed.
The passage never calls the early rods faulty in design (they did what they were meant to do), expensive or not sturdy; those are claims the text does not make.
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