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Questions 14～16 are based on the following talk. You now have 15 seconds to read questions 14～16. According to the talk, what do words mean

A．They are visual letters.
B．They are represented by sounds.
C．They are represented either by sounds or by letters.
D．They are signs called letters.

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Managerial economics.

Questions 14～16 are based on the following talk. You now have 15 seconds to read questions 14～16. According to the talk, what do words mean 您的浏览器不支持 audio 元素。