The people of the Peloponnesian peninsula a
shared a common language and religion

b
were separated by rugged hills leaving them disconnected and not united

c
were at constant war with each other

d
were united because of the flat, open countryside which made it easy to travel between different communities

La respuesta es la b estaban divididos por colinas escarpadas que los dejaban desconectados no unidos,

Al ser una isla con son montañosa abundate  era bastante difícil su acceso  y eso dificultaba las cosas pero en las partes bajas se daba el cultivo y comercio

Explanation:

answer; membership group;

answer; /// the above statement is ( true);