Sentence Correction

Carbon-14 dating reveals that the megalithic monuments in Brittany are nearly 2,000 years as old as any of their supposed Mediterranean predecessors.
(A) as old as any of their supposed

(B) older than any of their supposed

(C) as old as their supposed

(D) older than any of their supposedly
(E) as old as their supposedly


OA is B, but why is A wrong

With B it says monuments are older than mediterranean and with A it is saying it is as aold as its med pred. Meaning of both are correct, but if I go with B then the original meaning changes.

Also the grammer of both seems to be correct.

Any thoughts.

Answer should be B actually.

because if u think mathematically:

number X is 25 as equal as number Y [is].
--. although this seems grammatical correct...but its meaning is so weird..why don't we say..

X is equal to Y.
this is more clear and crisp.

but if we say:
number X is 25 more than number Y.
:- this make sense that
X = Y + 25

I think both A and B are correct, but B is better.

A could be much better written as:

Carbon-14 dating reveals that the megalithic monuments in Brittany are as old as any of their supposed Mediterranean predecessors.

Thanks fot the reply and your response makes sense but I am still not 100% convinced, just my bad. Anyone else wanna take a stab at it.