单项选择题

Questions 29 and 30 are based on the following news. At the end of the news item, you will be given I0 seconds to answer the questions.
Now, listen to the news.
How long do the volunteers work in a small barn on a farm outside of Freeport, Illinois

A．5 hours.
B．10 hours.
C．17 hours.
D．20 hours.
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