Your answer would be C). Traders. Some of the traders that went to India believed in Islam, and they could bring their religion wherever they want. The people of India started to see more and more people that believed in Islam, and those people were traders that were coming into their country. Because they were surrounded by so much people that are bringing their religion, Islam, into their country, they started following what the traders were believing in. The belief of Islam became a wide spread in India after one person practices the religion and shares it with others.