|Question 11Verbal

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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 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.
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 the bristlemouth (Chaetostoma yurubiense), which has a relatively wide head, bumped into more than half of the obstructions.
D