<span>Cultural diffusion was most advanced by the contact of business people with foreign cultures. A and B are definitely not correct as their impact is obviously not as important. C could be correct, but business people are those whom we should thank for today's cultural diffusion. It means that culture is all over the world - people are generally familiar with other nation's culture, and it's all thanks to business people who spread their culture when they go to work in foreign countries. </span>
The answer is not C, just because nations political leaders were together didn't imply culture-sharing. the choice of B or D are better because Indians did relocate and the economy of western countries are far superior than 3rd-world countries.. large corporations and spread out businesses do exist.
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