A Scientist Studied Peregrine Falcons to Determine Why the Numbers

A scientist studied peregrine falcons to determine why the numbers of birds was declining.She determined that

A) global warming (too much carbon dioxide) had increased the death rates in the newly hatched chicks.
B) the genetic diversity of the falcons was too low to sustain their population level.
C) the falcons had lost much of their habitat due to human developments.
D) the falcon's habitat had been fragmented and the subsequent edge effect affected their ability to hunt for prey items.
E) the levels of DDT in the environment were having a detrimental effect on eggs (causing the eggshells to be too thin) that were being laid by the female falcons.