Evidence about the activities of theMaya 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 althoughthey
b 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.
...
a. Maya has been gathered through archeological excavations althoughthey
b 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.
...
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