Self-study
Support Every photograph, because it involves the light rays that something emits hitting film, must in some obvious sense be true. ███ ███████ ██ █████ ██████ ████ ████ ████ ██ ████ ██████ ███████████ ████ ██ █████ ██ ██████ ███████ ███ █████ █████ ████ ██ ████ ██████ ██ ██████ ██████████ ███████ ███ ████ ██ ████████████ ██████ ████ █ ███████████
Argument Breakdown
The argument starts with the claim that every photograph "must in some obvious sense be true" because all photographs involve light rays from something striking film. The argument then states, however, that since a photograph "could always have been made to show something differently than it does" — in other words, since a photograph always shows only one perspective and not some different one it could have shown — photographs don't express the whole truth and so are also, in one sense, "false." The argument's conclusion, from these two premises, is that photographs can never definitively prove anything.
Analysis
There's some bizarre reasoning going on in this argument. The first premise seems to assume something is "true" simply if it represents something "real," and the second premise assumes something is "false" if it is incomplete or limited. But for this question, we don't need to get bogged down in whether the premises are valid. We're asked to find an assumption that allows the conclusion to be properly drawn, assuming the premises are true — i.e., a sufficient assumption.
A great place to start is just observing the premise → conclusion structure. The argument states that 1) photographs are in some sense true but 2) are also in some sense false, and concludes that photographs can't definitively prove anything. So one sufficient assumption would be:
some sense true AND some sense false → /definitively prove
We can expect the correct answer choice to suggest that either or both of the conditions provided by the premises are sufficient to get to the conclusion. (Remember that for a premise → conclusion structure that goes A AND B → C, either A → C or B → C also works as a sufficient assumption).
Analysis by ArdaschirArguelles
17.
Which one of the following ██ ██ ██████████ ████ █████ ██████ ███ ██████████ █████ ██ ██ ████████ ██████
a
Whatever is false ██ ███ █████ ████ ██ ██████ ███████ ███ █████ █████ ██████ ███████ ██████████ ██████
b
The whole truth ██████ ██ ██████
c
It is not ████████ ██ █████████ ███ ████████████ ██ █ ██████████ ██ ███ ██████
d
It is possible ██ ███ █ ██████████ ██ █████████████ ████████ ██ █████ ██ ██████████ ████████ ████████████ ███ █████ █████ ███ █████ █████████████
e
If something is █████ █████████████ ████ ██ ██ ████████ ██ █████ ████████████ ███ █████ █████ ███