单选题

In very dirty areas, increase the concentration but obey the manufacturer instructions for use.

AA. 在非常脏的区域，请增加浓度，但要遵守制造商的使用说明。

BB. 在非常脏的区域，请增加用量，但要遵守制造商的使用说明。

CC. 在非常脏的区域，请增加使用频率，但要遵守制造商的使用说明。

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正确答案：A （备注：此答案有误）

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