@yijiang Good way to put it. I can see how the sentence works now.

Still, I think its spiritually a run-on sentence, even if it's technically correct.

This is only a Level 5 because LSAC fumbled their job. Most people understand the flaw, but the correct answer choice is awful.

Answer B is bad because its end states that "...those two other sets have no members in common with each other".

In fact, all we know is that they may or may not have members in common.

Saying that they have none in common is an overstatement, which is a red flag.

You got me this time, LSAC.

Anyone struggling like I did, hope this helps:

Premise: Sandstrom's column caused damage.

Answer: ?

Conclusion: Thus, if Sandstrom expected damage, she should pay.

Compare how each following answer fits:

Option A

Premise: Sandstrom's column caused damage.

Answer: And one should pay if they they expected damage.

Conclusion Thus, if Sandstrom expected damage, she should pay.

Option D

Premise: Sandstrom's column caused damage.

Answer: And Sandstrom expected damage.

Conclusion Thus, if Sandstrom expected damage, she should pay.

Notice how option D adds nothing new to the problem?

Once option D establishes that Sandstrom DID expect damage, there is no point in the conclusion asking IF she expected damage. It's redundant.

In this case, I didn't consider "likely" as a qualifier, and it made no difference in my analysis.

STEM:

X so Y

/Y so /X

ANSWERS A and B didn't match. C did, and I stopped.

@KUROUSHFAIZRAFATIAN

The wording conceals the simplicity of the question:

X or Y.

/Y, so X.

Choose expensive prize (X), or choose familiar prize (Y).

Both prizes unfamiliar (/Y), thus choose expensive (X).

Same with the answer:

Double back (X), or flee for cover (Y).

No cover (/Y), so double back (X).

There is a typo in the written explanation "Answer choice C":

The explanation doesn't match the question provided:

C: If a university class involves extensive lab work, the class will be conducted in a laboratory; otherwise, it will be conducted in a normal classroom. Thus, if a university class is conducted in a normal classroom, it will not be conducted in a laboratory.

Domain: university class

Rule: lab-work → laboratory

Rule: /lab-work → classroom

_________________________

classroom → /lab-work

This conclusion should read: classroom → /laboratory

NOT: classroom → /lab-work