- Wed Jun 16, 2021 4:15 pm
C is a defender assumption. I think C could be a correct answer potentially if D were not present. C is just slightly less necessary than D when applying the negation test.
When we apply the negation test to D it completely wrecks the argument, whereas when we apply the negation test to C it only substantially weakens the argument.
When you negate D, the answer choice states:
"known fossils do not indicate the relative dates of origin of birds and dromesaurs."
This means they have no idea when these two species first arrived to the planet, completely wrecking their argument.
When C is negated, the answer choice states:
"knowledge of the earliest bird fossils and dromeosaur fossils is incomplete."
This certainly attacks our argument, but as long as we have a good understanding of their earliest finding, our conclusion is still relatively sound in comparison to answer choice D.
To summarize, answer choice D is just more necessary to the argument than answer choice C is. This is a case of having one good answer choice and one great answer choice.
I hope this helps, and I wish you all of the luck in your studies.