Answer:
The metaphor she uses is an instrument and it is effective
Step-by-step explanation:
When talking about the voice, Sara Bernhardt uses the metaphor of the instrument.
The metaphor is accurate because singing voice must be practiced just like an instrument. To sing well, one must learn how to do so, how to read the notes, control the voice, and take care of it. They should not do anything to harm the voice, and they need to practice before the performance, which might remind us of the tuning of the instrument.
A metaphor like this is effective, as it provides a wide array of meaning explaining what voice is to the performer, how they should use it, and what it means to sing along to the music. It is especially good because she uses metaphor which is in the same theme – the music – so it can be easily understood what she means and wishes to say.