TOEFL Listening: TPO-TOEFL阅读TPO - 5_3V2HGE1WLC49X8N$

Which of the following can be inferred from paragraph 4 about yellow and green colors compared with red and orange colors at the bottom of the forest? A. Yellow and green are better colors for signaling than red and orange colors. B. Orange and red are brighter colors than yellow and green. C. Yellow and green are likely to be more common in the background than red and orange D. Orange and red colors do not contrast as well with the forest floor as yellow and green do