The calendars produced by the Mayan and ancient Mesopotamian civilizations?

Question

anonymous · Answer

were both accurate 
 are still used today 
 were based on the moon's cycles 
 never worked correctly

anonymous · Answer

I think it might be D but I'm not sure. :( Please help I'm giving a medal

anonymous · Answer

Were based on the moons cycles.

anonymous · Answer

VICTORY SCREECH!! ULULULULULULULUL! Anywho. xD Thanks!!! :) You helped me loads!!!

anonymous · Answer

lol. It wouldn't be D, considering our own calendar is based off of theirs, so a b and c would technically be correct, but A is more of an opinion than a fact, and we do not really use their calendar, we have our own, so it would be C.

anonymous · Answer

Thanks!!! :)