单项选择题

Usually after-sale service is provided freely, because it is an important aspect of marketing strategy (策略).

A．通常在商品出售后要提供免费的维修服务，因为这是一种十分重要的营销策略。
B．通常售后服务是免费的，因为这是市场策略中的一个重要方面。
C．售后服务通常是免费提供的，因为这是营销策略的一个重要方面。
D．售后服务必须是自由方便的，否则就违背了市场策略。
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