|Question 12Verbal

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Water flowing around an obstruction creates vortices (patterns of swirls) of varying size; by detecting the vortices, fish can determine the size and position of the obstruction. Testing by Yuzo R. Yanagisuru, Otar Akanyeti, and James C. Liao using models of three head shapes narrow (low ratio of width to length), intermediate, and wide (high ratio of width to length) showed that for medium-sized vortices, fish with wide heads would be least able to distinguish between vortices and general turbulence in the water. A second research team has therefore hypothesized that in low-visibility conditions, wider-headed fish will be less likely than narrower-headed fish to detect obstructions.
Which finding, if true, would most directly support the second research team's hypothesis?
A study using obstructions that created medium-sized vortices in low-visibility conditions found that the bristlemouth (Chaetostoma yurubiense), which has a relatively wide head, bumped into more than half of the obstructions.
A
A study using obstructions that created medium-sized vortices in low-visibility conditions found that the wider-headed bristlemouth (Chaetostoma yurubiense) bumped into obstructions more often than the narrower-headed dusky smooth-hound (Mustelus canis) did.
B
A study using obstructions that created medium-sized vortices in low-visibility conditions found that the narrower-headed dusky smooth-hound (Mustelus canis) bumped into the obstructions just as often as the wider-headed bristlemouth (Chaetostoma yurubiense) did.
C
A study using obstructions that created medium-sized vortices in low-visibility conditions found that some specimens of dusky smooth-hound (Mustelus canis), which has a relatively narrow head, bumped into the obstructions more often than other specimens of the same fish did.
D