Vultures are large birds of prey; however, they rarely hunt for live animals, preferring to eat carrion (dead flesh) and garbage. Vultures are divided into the New World and the Old World vultures. There are seven New World species, including condors, and 15 Old World species, including the lammergeier and griffons. Both the New World and Old World vultures belong to the family Falconiformes. Although many members of the two groups appear similar, they are only distantly related.

Vultures live predominantly in the tropics and subtropics. New World vultures are found, as is indicated by their name, only in the Americas, while the Old World vultures inhabit Europe, Asia, and Africa. Although vultures are widely distributed, they are absent from Australia and most oceanic islands. Most of these birds inhabit open country.

All the New World vultures and some of the Old World vultures have bald heads. Most vultures can go for long periods without food, an adaptation to a feast-or-famine scavenging lifestyle. In some species the beak is exceptionally strong and heavy for tearing hide, muscle, and even bone. Eyesight in all vultures is well developed, as is the sense of smell in the turkey vulture. Old World vultures have relatively strong feet, but New World vultures have flat, weak feet that are poorly adapted for grasping.

Which line from the text develops the central idea that vultures have difficulty finding food?
A) In some species the beak is exceptionally strong and heavy for tearing hide, muscle, and even bone.
B) Most vultures can go for long periods without food, an adaptation to a feast-or-famine scavenging lifestyle.
C) Old World vultures have relatively strong feet, but New World vultures have flat, weak feet that are poorly adapted for grasping.
D) Vultures are large birds of prey; however, they rarely hunt for live animals, preferring to eat carrion (dead flesh) and garbage.