Hi yashsharma1,You're right that D doesn't
prove the constellations were visible in Africa. But here's the thing: a weakener never has to prove anything. It just has to open a crack in the argument, and D and C crack very different things.
Look at what the argument actually leans on:
-
Premise 1: Lapierre "painted from direct observations of his subject."
-
Premise 2: those stars "were not visible
in France during Lapierre's lifetime."
The whole case against him is:
those stars weren't in the French sky, and he only painted what he saw - so he couldn't have painted them.
Why D weakens: exile to North Africa puts him under a
different sky. The night sky over North Africa is not the same as the one over France, so stars invisible from France could well have been visible from there. That directly chips at Premise
2 - the "not visible in France" fact no longer blocks him, because he wasn't in France. You don't need it confirmed that those exact stars hung over Africa; you only need a plausible route by which direct observation becomes possible again. That's enough to weaken.
Why C doesn't: the argument never claims "only Lapierre could get this paint." So attacking that isn't the argument's real link. C says the red paint was available
only in France - if anything, that plants the painting
in France, exactly where the argument says these stars can't be seen. It leaves both premises fully intact, so the reasoning against Lapierre stands untouched.
So your instinct - "this doesn't prove Lapierre painted it" - is true of D, but that's the wrong bar. The bar is:
does it loosen a premise? D loosens Premise
2; C loosens nothing.
Quick gut check on the standard: if a choice said "Lapierre once sailed to the southern hemisphere," would that weaken? Yes - same move as D, a new sky, no proof required. That's the difference you're looking for.
Answer: Cyashsharma1
I selected C, which is the correct answer. But I have a point against option D as well. Similar to how in option C, just because red paint was available only in France does not mean only Lapierre could have painted the painting. Some other French painter or wandering artist might have given it a shot, in option D, how can the fact that he was exiled to Africa mean that painting was made by him? Were these constellations present as inspiration in Africa? There is no relevant info that supports that painting was made by Lapierre and hence this is as good of a contender for the correct answer.
KarishmaB can you help?