All I know is part A to the question :The geography of India greatly influenced the location of early settlements on the subcontinent. Both the Indus and the Ganges rivers carried rich silt from the mountains to the plains. When the rivers flooded, the silt spread over the plains and made the soil in the river valleys fertile for farming.
The church provided education by financing schools, seminaries, and colleges.
The church provided orphanages, shelters, and hospices (care for the terminally ill).
The correct answer is: Voters have a wider choice of candidates and ideas.
In a bi party system there are only 2 options which in general have a very narrow ideology and therefore divide a country. As a voter you may not feel identified with any of them. When more parties participate, different ideologies are represented and those voters have a greater probability to find one that suits them. Also they have more chance that their ideas are represented in Congress.