单项选择题

What is the main topic of the conversation

A．The conversion of volcanic waste to fertilizer.
B．The menace of currently dormant volcanoes around Mount Saint Helena.
C．The eruption of Mount Saint Helena and its effects on the environment.
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A．a cup of tea
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A．Study at a different school.B．Move to a warmer state.C．Get a travel agent’s license.
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B．Move to a warmer state.
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