【单选题】

Questions 7 and 8 are based on the following news.At the end of the news item, you will be given 20 seconds to answer the questions. Now listen to the news. According to the news, what measure did authorities take to light the fires

A、Residents were asked to vacate their homes,
B．Troops were brought in to help the firefighters.
C．Air operations and water drops continued overnight.
D．Another six fire engines joined the firefighting operation.