The finches of Galapagos island provide a shred of evidence in favour of
Special creation
Evolution due to mutation
Retrogressive evolution
Biogeographical evolution
As discussed in Theories of Evolution: Darwinism or Natural Selection -
Darwin finches of Galapagos islands had common ancestors later on whose beaks modified according to their feeding habits. Darwin's finches are also an evident example of geographical evolution. Hence, the correct option is (d).