Explanation
This question asks about a specific detail that we may or
may not happen to remember. The correct answer will require grounding in the
passage, so we can go back over the passage and scan for language that
describes difficulty. We have a hint: difficulty is an evaluative or charged
concept, so it's probably mentioned in paragraph three or four, not one or two.
Indeed, there are two difficulties described. One is in the rival theory, the
"contradiction" (line 30). The other is in the stress transfer method, as
described in the last sentence: "refining predictions with temporal constraints
appears to be far more problematic" lines (40-42). The correct answer to this
question will most likely hit on one of these two difficulties. Choice (D) is
in line with the second difficulty, since "temporal constraints" will amount to
the "timing." The other answer choices, for the most part, describe things that
can be determined, since they are
part of the stress transfer theory.
The correct answer is (D).
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