听力原文：Now about the news. An early morning fire damaged the historic Gallad House today

听力原文： Now about the news. An early morning fire damaged the historic Gallad House today. It destroyed the third floor of the building but fire fighters saved the first and second floors. There were only a few elderly people living in the building at the time and they were carried out to safety. The Galled House was built in 1718 and was used as a hotel for over 150 years. George Washington stayed here in 1782. The Galled family owned the building until the 1930s. Then they sold it to the Muss family. Five years ago it was made into a building for the elderly. Several fire departments were called to the scene. When we asked Fire Chief Andrew Bond how the fire started, he answered that it was most likely a burning cigarette caused it. Chief Bond promised to further examine into the cause.

Where did the fire probably start？

A．On the first floor．

B．On the second floor．

C．On the third floor.