C. Indian trade
Explanation:
- Islam spread in a peaceful way: Muslim camel caravan traders spread it to North Africa, seafarers to the east coast of Africa, from India to Indonesia, Malaysia and the Philippines.
- We find the largest Muslim population within a country globally, precisely, in Indonesia.
- Although this country has long been under the rule of the Netherlands, which conducted extensive population censuses during the administration of the area, insights into the demographic history of Muslims in Indonesia can be chronologically traced only after the declaration of independence in 1945.
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