Question: In 1989, the unusually low snowpack in portions of the Sierra Nevada Mountains led to a widespread emergence of Edith's checkerspot butterflies in April. In these regions, flowers do not appear until May. What was the most likely result of the early emergence of these butterflies?

  Options: 
 A. Most butterflies did not survive.
 B. Most butterflies reproduced earlier.
 C. Most butterflies switched to other food sources.
 D. Most butterflies adapted to the new environment.
Answer: A