Each or Both: The Acoma and Hopi are probably the two oldest

[Jessie_8112000]

Hi

The Acoma and Hopi are probably the two oldest surviving Pueblo communities, both dating back at least a thousand years.
A. both dating
B. both of which have dated
C. and each has dated
D. and each one dating
E. each one of which date

The correct answer is A. I would like to understand why C and D is wrong.
is C a run-on sentence?
in D: one cann't refer to anything, right?

[morningdew123]

"and" establishes equality of clauses whereas "," indicates that one is the principal clause and other the subordinating. Therefore replacing a comma by "and" alters the intent of the sentence.

[paruloberai]

"and" establishes equality of clauses whereas "," indicates that one is the principal clause and other the subordinating. Therefore replacing a comma by "and" alters the intent of the sentence.

the reason why i eliminated B and C is because they include past tense "dated" while the first part of sentence is in present tense "are".

but i still dont understand why OA is A and not D.

Can someone pls explain in more detail.

[jn.mohit]

is dating correct here ?

Why E is not considered ? what is wrong with E ?

[tapesh]

As per my understanding, each requires singular noun if not used with "of", in "each of" kind of phrases .
As in this sentence there is no singular noun, each has no referent.

And specifically

B : run on sentence as second clause is connected with comma only.
C: each can not be used without noun.
D: construction after "and" needs working verb; dating is a participle without helping verb.

E: each one of which is singular and requires singular verb i.e. dates.

So A is correct, modifying communities using participle.

Ron please correct me if my reasoning is wrong.

Thanks.

[RonPurewal]

the questions raised here are answered on this link:

post39062.html#p39062