Which is the most appropriate title for the passage?

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问题 Which is the most appropriate title for the passage?
  
China and India have roughly the same population, but when it comes to mobile phones, there is no comparison between the two. In India, seven years after the launch of mobile-phone services, there are only 10 million users. In China, half that number signs up as new subscribers every month.
    Geography and culture explain some of the differences. The concentration of economic activity in China’s eastern coastal region gave its mobile operators big economies of scale, allowing lower prices. In China, telephones quickly came to be regarded as fashion items, something that has only recently happened to India.
    But the main difference is regulation. India chose a licensing policy that divided the country into 22 regions, each with two licenses to operate mobile networks. Bidding in multiple regions was restricted. This aimed to promote competition, but led to a fragmented market with a baffling array of operators, none of which has economies of scale. Limited spectrum also hurt service quality.

选项 A、The average disposable income is lower in the region.
B、The GDP is higher in the region.
C、The costs of operators are lower due to a greater number of users of mobile phone services in the region.
D、The operators compete with each other in order to win over subscribers.

答案C

解析 因果关系判断。根据原文第一段,我们可了解中国使用移动电话人口激增的事实。第二段第一句,我们得知这种情况是由于地理和文化原因造成,紧接着文章以中国东部沿海地区为例,进一步解释说中国东部沿海地区强调经济发展给移动电话开发商们“big economies of scale,allowing lower prices”,由上述事实可推断,开发商成本降低的根本原因是该地区移动电话使用人数多。因此,选项C的说法是正确的。
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