Like English and Italian, each of which

Yes that's the idiomatic structure.
Just as x so y

C for me...

But I still think the sentence structure is awkward.

Just as .....so sign languages

Can anyone clarify??

My analysis of answer choices is shown above

Like English and Italian, each of which have elaborate rules for forming words and sentences, so sign languages have rules for individual signs and signed sentences.

(A) Like English and Italian, each of which have elaborate rules for forming -- subject verb agreement -- each ... have
(B) Similar to the elaborate rules that English and Italian have to form -- illogical comparison - compare "rules" and "sign languages"
(C) Just as English and Italian have elaborate rules for forming - Correct
(D) As with English and Italian, both having elaborate rules to form - "having" is not correct. "having" indicates that something started in the past, is happening right now, and may not always be occurring. That would not apply well here.
(E) In the same way that there are elaborate rules used to form English and Italian - Bad comparison. "In the same way that there are rules . . ., so to sign languages"

Answer C
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Like English and Italian, each of which have elaborate rules for forming words and sentences, so sign languages have rules for individual signs and signed sentences.

(A) Like English and Italian, each of which have elaborate rules for forming "each of which" is singular - incorrect usage of plural "have". Eliminate.

(B) Similar to the elaborate rules that English and Italian have to form "rules" are being compared to "sign language". Eliminate.

(C) Just as English and Italian have elaborate rules for forming Correct answer.

(D) As with English and Italian, both having elaborate rules to form "As with...so" is idiomatically incorrect - the correct idiom is "Just as...so". Eliminate.

(E) In the same way that there are elaborate rules used to form English and Italian "way" (that there are rules) is being compared to "sign languages". Eliminate.

Hope this helps.

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