The correct answer is letter B.
Explanation: In this case the most accurate answer is 24 hours because the others not match with the experiment.
I believe The answer is A.a class system
The option that tells us the main theme of the passage is the fact that With the arrival of talking films in the 1920s, silent films became unprofitable.
<h3>What is the summary of the passage?</h3>
This passage is telling us of the reasons why the people had to stop making the silent movies. It is telling us of all of the issues that came with it and why the film makers had to do away with them.
First the movies were said to have been destroyed. That is the ones that were already in existence and how many of them had to be recycled so that they could get the metals that they contain.
All of this came to be based on the fact that these movies were no longer seen to be profitable anymore. Hence it was of no use having them around.
Read more on theme of a story here:
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In considering how to respond, you should recognize the feelings of Mrs. White in which she feels despair and guilt that was evident on her statement. It is best to recognize her feelings, have an empathy towards her feelings and to find a best way that will suitable reply that will not offend the other party.