Which of the following sentences uses punctuation correctly?

a.  According to Emerson, people should occasionally silence the noise of their inner voices and learn to listen to the world's unconscious voice.

b. According to Emerson, people should occasionally silence the noise of their' inner voices and learn to listen to the world's unconscious voice.

c.  According to Emerson, people should occasionally silence the noise of there inner voices and learn to listen to the world's unconscious voice.

d.  According to Emerson, people should occasionally silence the noise of they're inner voices and learn to listen to the world's unconscious voice.

I chooes A because C and D are incorrect in C they wrote (people should occasionally silence the noise of THERE inner voices)
In D they wrote(people should occasionally silence the noise of THERE'RE inner voices)
But in B i think it is incorrect too

yes A

In B the word
their'
is incorrect because of the '