Explanation
Choice B is the best answer. The student argues that the presence of contrasting colors does not fully explain the bumblebees' preference for certain flowers over others. The fact that bumblebees visit the evening blooming cereus for foraging more often than the bluebell, even though neither has contrasting colors, supports the student's argument.
Choice A: This supports the study's conclusion that bumblebees prefer snapdragons to vulcan's trumpets due to the snapdragons' contrasting colors.
Choice C: That bumblebees visit white lilies and vulcan's trumpets equally would be consistent with the study's conclusion.
Choice D: This finding is not relevant to either the study or the student's argument.
✨ Expert's Tip ✨
Recognize that even among the four plain-colored flowers, one received more visits from the bumblebees than the rest.