Why Is the Work of Alfred Russell Wallace Considered When

Why is the work of Alfred Russell Wallace considered when discussing the theory of evolution?

A) He was an English naturalist who had arrived at many of the same conclusions as Darwin through his own research in the Amazon.
B) His work is not considered, as he was mistakenly credited with the theory of natural selection.
C) He was a British dog breeder who worked on artificial selection experiments in the same way Mendel worked on sweet peas to determine inheritance.
D) He was well known and gathered even more evidence to support evolution than Darwin, though from the Amazon rather than the Galapagos.