Uhhhh, this seems pretty good, too. What the hell? This is wrong on a few levels. Most glaringly is the word “false.” Does “unacceptable” mean “false?” I didn’t think so, which was my justification for eliminating this answer choice during the timed exam. What if T theory explained everything truthfully, but another theory simply explained everything T explains, but more? That would make T theory not false, but still unacceptable. Next, are the “sibling species” incompatible with the theory? Incompatible to me means inconsistent. In T theory, the two things look the same, so T theory counts them as the same species. There doesn’t seem to be any internal inconsistency/incompatibility problem in the argument. C is clearly better.
Is there any other reason apart from the word "unacceptable" for why D is incorrect?
It seems like the author is saying: The idea that some species can look the same and not be part of the same species (because they cannot interbreed) is not compatible with the typological theory, therefore is not acceptable.
I think answer choice "D" is also wrong because what "D" is stating is not a flaw. If a fact/phenomena is incompatible with the theory thats usually grounds for proof that the theory is wrong and is unacceptable/false in its attempt to make sense of the physical world.
Comments
It seems like the author is saying: The idea that some species can look the same and not be part of the same species (because they cannot interbreed) is not compatible with the typological theory, therefore is not acceptable.