CEdward
So to be honest, I initially chose A moreso because my hand was forced than anything else because I did recognize the idiom error. However, I don't think C is the correct answer either.
The school officials believe that students will be equally likely to break the new rules as the current ones.
(A) equally likely to break the new rules as
-as...as is the correct idiom
-suggests nonsensically that the students will be equally like to break the new rules AS the current ones; so the new students will do so AS? No...
(B) as much likely to break the new rules as
-'much' here is nonsense and not necessary
(C) as likely to break the new rules as they are
-OK so this one has the correct idiom as...as
-BUT from a meaning perspective, it makes no sense whatsoever. Why would you say that the students are likely to break the new rules AS THEY ARE the current ones? Would you be more likely to break the rules on the grounds that something is current alone? There should be a comparison happening here. Even if you got past that, it would be easier to reframe the sentence in a way which foregoes the comparison altogether: "as they are the current ones" is completely unnecessary. Just say "...students will be likely to break the new rules"(D) equally likely to break the new rules as they are
-they? Same issue as C
(E) equally likely that they will break the new rules as
-likely to is idiomatic
generis thoughts?
CEdward , this sentence contains ellipsis, which I have inserted using boldface type:
→ The school officials believe that students will be
as likely to break the new rules as they are [likely to break] the current ones.
Quote:
-BUT from a meaning perspective, it makes no sense whatsoever.
(C) is the correct answer. It makes sense.
This question is modeled on an official question that I link to below.
The question is good.
Quote:
Why would you say that the students are likely to break the new rules AS THEY ARE
likely to break the current ones?
Would you be more likely to break the rules on the grounds that something is current alone?(I inserted the highlighted material.)
Interesting analysis. I'm glad that you investigate meaning!
Answer to your italicized question: of course not.
Of course people are not more likely to break rules simply because the rules are new.
I think you are imputing a meaning to the sentence that does not exist, although I can see your perspective.
Let's shift gears a little.
The sentence does not state or imply that students will be likely to break new rules because the rules are
new.
(You're right: such logic is absurd.)
The sentence implies that students will be likely to break new rules because students are likely to break
all rules.
Quote:
There should be a comparison happening here.
There is a comparison happening here: I inserted the elided words in order to make the comparison clear.
I grant that the use of ellipsis in this sentence is quite sophisticated.
Above, I wrote, "The school officials believe that students will be
as likely to break the new rules as they are [likely to break] the current ones.."
What is compared in this sentence?
Students' likelihood to break current rulesand
Students' future likelihood to break new rulesThose likelihoods are equal. That's the comparison.
Quote:
Even if you got past that, it would be easier to reframe the sentence in a way which foregoes the comparison altogether: "as they are the current ones" is completely unnecessary. Just say "...students will be likely to break the new rules"
I like how engaged you are.
We can't "just say" that "students are likely to break the new rules" and simultaneously capture the logic of the sentence.
You have just ejected one-half of the comparison.

Foul. Yellow card.
The officials instituted some shiny new rules that they hope will fix a problem.
But the officials are worried.
The shiny new rules might not fix the problem.
Why not?
Answer: because students are AS likely to break new rules AS they are likely to break current rules.
Underlying logic? Students are likely to break
all rules.
(Why pass new rules, then, you ask? Now we are way out of SC land.)
I understand your frustration and that of many others.
As a writer and an editor, I must consciously hold back my instinct to rewrite sentences and simultaneously remember that my job in SC is to find the least bad of five options.
GMAT SC writers test concepts really well, but often they must sacrifice elegant prose to do so.
(Everyone should try writing just one SC question. Just one. Try.)
So we are not looking for a perfect sentence.
We are looking for the sentence that remains after we have eliminated the four worst answers.
You might want to take a look at a similar
official question, here.
Finally, above all else, everyone, please remember the pattern.
Correct:AS . . . AS
Wrong:AS . . . THAT
AS . . . THAN
EQUALLY . . . AS
I hope that answer helps.