“And” or “And in” with “in both”

Please help which one will fit in the blank and why?

  1. The belief in life after death is prevalent in both primitive societies _________ advanced

A. and

B. and in

C. and also

D. also

E. also in


Well, I found an answer on Grammarly. They didn’t provide the reason but the votes are for “And” with “in both”

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