下列哪个句子最符合科技英语写作规范？
A、The loudspeaker, an electroacoustic transducer, converts audio-frequency power into acoustic power.
B、The loudspeaker; an electroacoustic transducer; converts audio-frequency power into acoustic power.
C、The loudspeaker—an electroacoustic transducer, converts audio-frequency power into acoustic power.
A、The loudspeaker, an electroacoustic transducer, converts audio-frequency power into acoustic power.
B、The loudspeaker; an electroacoustic transducer; converts audio-frequency power into acoustic power.
C、The loudspeaker—an electroacoustic transducer, converts audio-frequency power into acoustic power.