Evidence about the activities of the
Maya has been gathered through archeological excavations although they may never be completely authenticated because of difficulties in applying carbon dating tests to the fragile remains of the ancient civilization.
a. Maya has been gathered through archeological excavations although
theyb Maya, gathered through archeological excavations, but it
(Lack of main verb in the sentence)c. Maya has been gathered through archeological excavations but
(Correct)d. Maya, although gathered through archeological excavations, it
(Same as B)e. Maya has been gathered through archeological excavations,
which (It is evidence not excavations may never be completely authenticated)
Kudos please if you like my explanation!
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