likitwill
I'm still confused with the explanations between A and B.
Why can't the intention of the sentence mean both monuments in Brittany and monuments in Mediterranean are the same age, which is 2000 years old?
So the original sentence could mean the monuments in Brittany are 2000 years old, as same as the monuments in Mediterranean are.
If I write, "Tim is as old as John," I'm communicating that Tim and John are the same age.
If I write, "Tim is ten years older than John," I'm communicating that Tim is older.
If I write, "Tim is ten years as old as John," it's not clear what I'm saying. One person, in theory, could be
ten times as old as someone else. But "ten years as old as?" That's nonsense.
This is effectively what we have in (A). Because it's illogical, we can eliminate it.
I hope that helps!