What caused the mudslide according to the research hydrologist?

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问题 What caused the mudslide according to the research hydrologist?
  
Jim O’Connor, a research hydrologist told National Geographic that the mudslide, which was up to 4. 5 meters deep in some areas, was caused by ground made unstable by heavy rainfall.
The phonograph record began its commercial ascent in the 1910s.

选项 A、In 19 th century.
B、In 20th century.
C、In 21st century.
D、In 18th century.

答案B

解析 “in 1910s”指的是1910-1919年之间,属20世纪,故B为正确选项。
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