|Question 10Verbal

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Water flowing around obstacles creates vortices (patterns of swirling water). Many fish can detect these vortices, which can obscure the sound of approaching predators. Testing by Yuen Vanaelsuru, Otar Akasveti, and James Liao using models of three head shapes—narrow (low ratio of width to length), intermediate, and wide (high ratio of width to length)—suggested that large vortices with intermediate heads would be better able than narrow-headed fish to distinguish between vortices and general turbulence in the water. A second research team has therefore hypothesized that in low-visibility conditions, intermediate-headed fish will be more likely than narrow-headed fish to detect predators that create large vortices.
Which finding, if true, would most directly support the second research team's hypothesis?
A study using obstructions that created large vortices in low-visibility conditions found that some specimens of the intermediate-headed black sea bass (Centropristis striata) avoided the obstructions more often than others did.
A
A study using obstructions that created large vortices in low-visibility conditions found that the narrow-headed flat needlefish (Ablennes hians) bumped into the obstructions more often than the intermediate-headed black sea bass did.
B
A study using obstructions that created large vortices in high-visibility conditions found that the intermediate-headed black sea bass bumped into the obstructions just as often as the narrow-headed flat needlefish did.
C
A study using obstructions that created large vortices in low-visibility conditions found that the flat needlefish (Ablennes hians), which has a very narrow head, bumped into more than half of the obstructions.
D