The story says:

Annie's head thrummed with fatigue. The planes had woken her up at five o'clock. She stared out past the stoop to the small yard, where a skeletal tree's branches were lined with icicles, sharp and shining, angled like a predator's teeth.

Which phrase shows that Annie feels that the scene outdoors seems threatening?

woken her up at five o'clock
stared out past the stoop
angled like a predator's teeth
branches were lined with icicles

angled like a predator's teeth