Adominant group does not have to be a majority because dominance is determined by

Dominance is the power and privilege an individual or a group has on the rest. It is quite possible that an opinion might hold majority view but cannot be admitted the dominant view for example in a tribal chain of command even if the majority holds a view it can be negated by the tribal head on the basis of dominance.

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;

a) it is located in central mexico.