1. This answer was edited.

    none of them are wrong as among people is used in places where we are talking of more than two people eg; this matter should remain among the people of this town and between people is used when we are talking only for two people eg; the case was only been discussed between people like us  

    none of them are wrong as among people is used in places where we are talking of more than two people

    eg; this matter should remain among the people of this town

    and between people is used when we are talking only for two people

    eg; the case was only been discussed between people like us

     

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  2. reminder means a thing which causes someone to remember something in certain example; I have put a reminder for my medicine remainder means a part of something that is left over when other parts have been completed example; if we divide five with two the remainder is  one

    reminder means a thing which causes someone to remember something in certain example; I have put a reminder for my medicine

    remainder means a part of something that is left over when other parts have been completed

    example; if we divide five with two the remainder is  one

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