So here we are presented with a Strengthen with Sufficient Premise question. A premise is sufficient for a conclusion if the existence of the premise guarantees the existence of the conclusion.
The conclusion of this argument is "nothing can ever be definitively proved with a photograph." Why? Because while every photograph must in some obvious sense be true, since they cannot express the whole truth, they are, in that sense, false.
Remember, we are looking for the answer choice that 100% guarantees the conclusion. Let's delve in.
(A) is CORRECT because it 100% guarantees the conclusion. This answer choice states that whatever is false in the sense that it cannot express the whole truth (aka "FSCEWT"), cannot furnish definitive proof (aka "not DP"). We can diagram this answer choice as follows:
FSCEWT ===> not DP DP ===> not FSCEWT
The argument states that because a photograph could always have been made to show things differently than it does, it cannot express the whole truth and, in that sense, is false. This is the sufficient condition of the general principle found in answer choice (A), which guarantees that a photograph cannot furnish definitive proof, i.e. the necessary condition of the general principle found in answer choice (A).
Hope that's helpful! Please let us know if you have any other questions!
victoriacMay 11, 2018
How can you tell if it is a sufficient premise question or strengthen with necessary?
