Which of the following did Egyptians and Mayans have in common?

both societies had an advanced understanding of astronomy

both societies practiced mummification of the dead

neither society practiced human sacrifice

neither society had a complex caste system

The 2nd and 3rd answers are wrong for sure. Leaving you with 1st and 4th. Mayans did not mummify their dead. Mayans also practiced human sacrifice. That knocks 2 answers out. Personally, I'd go with the 1st choice as they both had an understanding and used the stars/planets as clocks, events, etc.