The correct option is B Auricle
The fore-limbs of different mammals are modified suitably to perform different functions, according to their environment. For example, all the vertebrates in general, and all mammals, in particular, have a common basic pattern of construction of their forelimbs. The forelimbs of mammals consist of five parts namely upper arm, forearm, wrist, palm and phalanges, but they are used differently in different animals.