SECTION A CONVERSATIONS In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation. What caused the deposits
A．The hydrochloric acid broke the carbon bonds in the carbon dioxide. B．The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide. C．The burning magnesium broke the carbon oxygen bonds in the carbon dioxide. D．The gas collection method broke the carbon-oxygen bonds in the carbon dioxide.