Why Are Kirkland's Warblers Particularly Vulnerable to Human Development

Why are Kirkland's warblers particularly vulnerable to human development?

A) They're extremely sensitive to any disturbance in their habitat.
B) They require young jack pine trees, which tend not to grow where humans live and suppress forest fires.
C) They follow cattle and bison around and eat insects they stir up, and bison are rare near human developments.
D) They require tall jack pine trees, which take a long time to grow and humans tend to remove when they develop an area.
E) They will only nest in recently burned areas and people suppress fire when they move into an area.