Self-study
I'd like to discuss this question, as it seems there's no explanation available on 7sage. That should be rectified, as this is a very tricky and unconventional question which therefore warrants a thorough explanation.
In the mean time, I'll give it a shot:
The question stem here seems to be, "Which one of the answer choices will fully justify (or make must be true) one of the two question options, definitively?"
It's an odd question in that it doesn't ask you to justify approach A or approach B -- it instead asks you to identify a principle that will make EITHER ONE OF A or B must be true, whilst simultanouesly making either B or A must be false -- all based on the stimulus information.
So far as I can tell, (B) is the only one that does this with that level of certainty. It says that, based on the stim information available, the renovation was correct while the demolition camp was incorrect.
Unusual, difficult question.
Admin Note: Edited title. For LR questions, please use the format: "PT#.S#.Q# - brief description of the question."
tl;dr:
home --not nec.--> house
house --not nec.--> home
therefore
house --not nec.-->home
the first example doesn't do anything to support the conclusion. so we can take it or leave it.
If we tried to negate the first claim, writing: home-->house, and !house-->!home, neither of those tell us anything about whether house--not nec.--> home. The entire question is an elaborate shell game.
Therefore, C) is correct.
A) is mutually exclusive from C) so it's incorrect.
D) (highlights ambiguity of "at home") would be a decent answer EXCEPT that the question stem specifically asks, "how does the claim about home not necessarily house relate to the conclusion?"
Because D does not relate the claim to the conclusion, it's incorrect.