Charles darwin developed the theory of evolution. around the same time, alfred wallace also developed a similar theory of evolution. both scientists studied different organisms. which best describes the experiments of darwin and wallace
repeated trials or experiments resulted in a similar conclusion.
multiple approaches independently resulted in a similar conclusion.
multiple approaches took place across multiple disciplines.
repeated trials or experiments took place across multiple disciplines

Multiple approaches independently resulted in a similar conclusion.

Darwin was writing up his theory in 1858 when he received an essay from Alfred Russel Wallace, who was in Borneo, describing Wallace's own theory of natural selection. Joint publication of Darwin's essay together with Wallace's paper was immediately prompted but received little notice from the public.

The public's disregard of their work spurred Darwin to write an abstract of his work which was published in 1859 as his book "On the Origin of Species".

That would be a working theory.