请教OG5 的翻译

5. 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) <!--[endif]-->as old as any of their supposed
    

(B) <!--[endif]-->older than any of their supposed
    

(C) <!--[endif]-->as old as their supposed
    

D) <!--[endif]-->older than any of their supposedly

请教older than any of their supposed
        Mediterranean predecessors 的翻译，实在搞不清

如果their指megalithic monu­ments ，那supposed跟在后面又是什么意思
    

碳14年代测定显示：布列塔尼亚的巨石纪念碑比地中海的要早约2000年？

对不对，顿悟predecessors 不是人